Code lập trình

7/28/2019 Code lp trnh

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#include

#include// for using _nop_() function

#define port P2

#define dataport P0

sfr16 DPTR =0x82;

sbit trig=P3^5;

sbit rs=port^0;

sbit rw=port^1;sbit e=port^2;

void delay(unsignedint msec)

{

int i,j;

for(i=0;i


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s=range/100;

range=range%100;

if(s!=0)

{

lcd_data(s+48);

}

else

{lcd_cmd(0x06);

s=range/10;

range=range%10;

lcd_data(s+48);

lcd_data(range+48);

lcd_data(' ');

}

}

else

{

range=0;// indicates that there is no obstacle in front of the sensor

lcd_cmd(0x06);

lcd_data(0);

}

return range;

}

void main()

{lcd_cmd(0x38);

lcd_cmd(0x0c);

delay(2);

lcd_cmd(0x01);

delay(2);

lcd_cmd(0x81);

delay(2);

lcd_data_string("start");

delay(20);

TMOD=0x09;//timer0 in 16 bit mode with gate enable

TR0=1;//timer run enabled

TH0=0x00;TL0=0x00;

P3=0x04;//setting pin P3.2

while(1)

{ get_range();

delay(2);}

}

Code lp trnh:do khoang cah bang sog sieu am hhien thi ked 7 doan

#include//================sbit Led1 = P0^3;sbit Led2 = P0^2;sbit Led3 = P0^1;sbit Led4 = P0^0;

sbit Led_bao_1 = P3^6;sbit Led_bao_2 = P3^7;sbit trig = P3^1;sbit echo = P3^2;//=================unsigned char M[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};unsigned char M1[10]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};int a,b,c,d,e,f,g,h;unsigned char timel,timeh,i;


3/37

float time;bit ok;

void delay(unsigned int t){unsigned int i;

for(i=0;i


4/37

IT0=1; //ngat ngoai 0 che do fallingIT1=1;EX0=1; //cho phep ngat ngoai 0EX1=1;EA=1; // cho phep ngat toan cucok=0;while(1){if(ok==0){trig=1;delay(20);trig=0;ok=1;}time=timel+timeh*256;hienthi(time/58);}}


5/37

Sn phm thng mi

Tm kim

Thnh vin

Lch

Tr gp

Custom SearchThi gian hin ti : 23-05-2013, 11:23 PM Xin cho qu khch! (ng nhpng k)

Nhn t cc sn phm t Texas InstrumentsTuyn sinh lp lp trnh nhng ARM trn Linux,

Raspberry PiSn phm khng dy v nh v

Knh video ca din n

Thit k d n in t theo yu cu

K Thut in Tiu Khin T ng HaVi x l, vi iu khinVi iu khin h 8051

10 chng trnh cho vi iu khin AT89C51

nh gi ch : 75 phiu bu - Trung bnh 2.85
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Ch | Tuyn tnh10 chng trnh cho vi iu khin AT89C51

01-09-2011, 04:25 PM (c chnh sa: 01-09-2011 04:33 PM bi msp430.)Bi vit: #1

msp430

Moderators

Bi vit: 222%%TYL_NUMTHANKEDLIKED%

%Tham Gia: Aug 2011Danh ting: 16Thanks: 2Given 20 thank(s) in 15 post(s)

10 chng trnh cho vi iu khin AT89C51nguyn l lm vic ca ic vi iu khin AT89C51 (Bn xem hnh).
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7/37

IC AT89C51 c 40 chn. Cng dng ca cc chn nh sau:

* Chn 40 ni vo ng ngun 5V, chn 20 cho ni masse.

* Chn 9 ni vo mch reset vi in tr 10K v t 10uF. Khi mch va c cp in, t np vko chn 9 ln mc p cao to tc ng reset. Sau mt lc chn 9 tr li mc p thp. ICAT89C51 bt u hot ng t trng thi khi u.

* Chn 18, 19 mc thch anh nh tn. Nh vy tn s xung nhp s l 1Mhz (hay 1us). Ngangthch anh mc 2 t nh dng b nhit n tn (Bn xem hnh).


8/37

* Chn 31 Bn phi cho treo ln mc p cao, xc nh l mch ch lm vic vi b nh ni

(V mch khng dng thm b nh ngoi).* Bn ch , ic c 4 cng, l port 0 (p0), port 1 (p1), port 2 (p2) v port 3 (p3). Mi cng c 8chn. Mi hot ng ca ic vi iu khin u c thc hin trn cc cng ny.

Ghi nhn: Bn thy ic AT89C51 ch cn mt t linh kin bn ngoi l c th chp hnh cccu lnh c trong b nh EEP-ROM, Bn dng cc cu lnh ny xc nh trng thi inp cao thp trn cc cng v dng cc mc p cao thp ny cho vic iu khin cc dng mchin, hay cc thit b.

Bi 1: Vit chng trnh Led trn chn s 1 (p1.0) lun nhp nhy.


9/37

ORG 0000h ; Khi u t thanh ghi c a ch l 0000h

START: CLR P1.0 ; t chn p1.0 xung mc p thp, Led s sng.

LCALL DELAY ; Cho gi trnh lm tr (c tn nhn l delay).

SETB P1.0 ; t chn p1.0 ln mc p cao, Led s tt

LCALL DELAY ; Li cho gi trnh lm tr (c tn nhn l delay).

LJMP START ; Cho nhy v dng lnh vi tn nhn l start, cng vic s lp li.

DELAY: MOV R5,#20 ; Np tr 50 vo thanh nh r5.D1: MOV R6,#20 ; Np tr 20 vo thanh nh r6.

D2: MOV R7,#248 ; Np tr 248 vo thanh nh r7.

DJNZ R7,$ ; Cho gim r7 theo bc -1 cho n 0.


10/37

DJNZ R6,D2 ; Cho gim r6 theo bc -1, cha bng 0 th nhy v D2.

DJNZ R5,D1 ; Cho gim r5 theo bc -1, cha bng 0 th nhy v D1.

RET ; Quay li dng lnh sau lnh lcall.

END ; dng bin dch.

Phn tch cch vit cc cu lnh:

Bn thy khi u lun dng cu khai bo gi lnh: org 0000h

Ngha l mi vic s bt u t thanh nh c a ch l 0000h. y cng l thanh m chngtrnh s nhy n mi khi Bn nhn nt Reset.

v kt thc vi khai bo gi lnh: end

Cc cu lnh sau khai bo bi gi lnh "end" s khng c bin dch.

Ni r hn v cch tnh thi gian tr ca on chng trnh con delay:

Trong hnh trn do dng thch anh 12MHz nn mt chu k my s l 1us.

Vy cu lnh: mov r6,#20 s thc hin 2 ln. Bn phi cho nhn 2. T cch tnh nh sau:

MOV R6,#20 2ln 2

D1: MOV R7,#248 2 ln 22224849820

DJNZ R7,$ 2 ln 2248 (498DJNZ R6,D1 2 ln2204010002

Qua cc nhn thi gian tr ca on chng trnh delay ny l 10.002ms.

Nu Bn mov vo r6=10 th thi gian tr s l 5ms.Nu Bn mov vo r6=20 th thi gian tr s l 10ms.

V c thi gian tr l 200ms. Bn dng thm thanh nh r5. Mov vo r5=20. V nh vy onchng trnh tr delay 200ms nh sau:

DELAY: MOV R5,#20 ; chuyn vo thanh ghi r5 s thp phn 20.

D1: MOV R6,#20 ; chuyn vo thanh ghi r6 s thp phn 20.


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D2: MOV R7,#248 ; chuyn vo thanh ghi r7 s thp phn 248.

DJNZ R7,$ ; cho s trong r7 gim theo bc -1, ti ch v ch n khi bng 0.

DJNZ R6,D2 ; cho s trong r6 gim theo bc -1, v nhy v D2 nu cha bng 0.

DJNZ R5,D1 ; cho s trong r5 gim theo bc -1, v nhy v D1 nu cha bng 0.

RET ; quay tr li thc hin dng lnh sau lnh call.

Bi 2: Vit chng trnh dng Led trn chn 1 (p1.0) theo di kha in K1 trn chn 10 (p3.0).

* K1 ng li Led sng.* K1 b ra Led tt.

ORG 0000H ; Khi u t thanh ghi 0000h

START: JB P3.0, LIG ; Lnh nhy. Nu chn p3.0 bit 1 th nhy n tn nhn LIG, Led tt

CLR P1.0 ; t p1.0 v bit 0, chn p1.0 mc p thp. Led s sng

SJMP START ; Nhy v tn nhn START.

LIG: SETB P1.0 ; t p1.0 v bit 1, chn p1.0 mc p cao, Led tt.


12/37

SJMP START ; Nhy v tn nhn START.

END ; Dng bin dch y.


y, Bn dng lnh nhy theo iu kin bit, tc lnh jb (jump bit) hay jnb (jump no bit).

JB P3.0, LIG

Lnh ny c ngha l s nhy theo trng thi bit trn chn p3.0.

Nu xt chn p3.0 mc p cao (nt nhn K1 h) th nhy n tn nhn LIG, vNu xt chn p3.0 mc p thp (nt nhn K1 kn) th thc hin cu lnh k tip bn di.

Bn nh, khi chn p3.0 mc p cao th Led tt v khi chn p3.0 mc p thp th Led s sng.

Bi 3: Vit chng trnh dng 4 led trn cc chn 1 (p0.0), 2 (p0.1), 3 (p0.2), 4 (p0.3) cho bittrng thi ca 4 kha in trn cc chn 5 (p0.4), 6 (p0.5), 7(p0.6), 8 (p0.7).

* Khi kha in ng li Led tng ng sng.* Khi kha in nh ra, Led tng tng tt.


13/37

ORG 0000H ; Bt u t thanh ghi 0000h

START: MOV A,P1 ; Ly trang thi trn cng port 1 np vo thanh ghi tch ly a.

ANL A,#0F0H ; dng logic AND che 4 bit thp, gi nguyn trng thi 4 bit cao.

RR A ; cho ni dung trong thanh ghi a quay qua phi 1 bit.




XOR A,#0F0H ; dng logic Ex-OR pht hin s khc bit trn 4 bit thp.; nh vy Led ng vi v tr c bit 0 s pht sng.


14/37

MOV P1,A ; Chuyn trng thi ca thanh ghi a ra trn port 1 lm sng Led.

SJMP START ; nhy v tn nhn start tip tc lm nh trn.

END ; ngng bin dch dng lnh ny.


a- Dng 4 phm tt m 4 Led trn port 1

Bn cho chuyn trng thi ca port 1 vo thanh ghi tch ly a, ch trng thi ca 4 bit cao. Nphn nh nt nhn K1, K2, K3, K4.

b- Dng logic And vi hng 11110000b cho che 4 bit thp.


15/37

Bn ly logic AND gia thanh a v hng 0f0h (hay l 11110000b), cch lm ny l bo tontrng thi ca 4 bit cao, cn 4 bit thp u ha ra bit 0. Ngi ta quen gi l cho che 4 bit thp.

c- Dng lnh quay phi 4 ln di 4 bit cao xung 4 bit thp.

Dng lnh rr a cho quay bit qua phi, nu cho quay 4 ln th 4 bit thp s ln nm vng 4 bitcao v 4 bit cao s xung nm vng 4 bit thp. Chng ta ni cho chuyn trng thi ca 4 bitcao xung vng 4 bit thp. Cng c th dng lnh swap.

d- Dng logic Ex-Or pht hin cc bit khc nhau.


16/37

Ly logic D-OR pht hin cc bit ging nhau hay khc nhau:

Nu cc bit ging nhau, kt qu s l bit 0.Nu cc bit khc nhau, kt qu s l bit 1.

T ng ra, Bn s thy Led nm trn bit 0 s pht sng. Cc Led nm trn bit 1 s tt.

Bi 4: Vit chng trnh cho 8 Led trn port 1 ln lt nhp nhy, nhy qua tri ri nhy quaphi.


17/37

ORG 0000hSTART: MOV R2,#8 ; t tr 8 (s ln m) vo thanh ghi r2MOV A,#0FEH ; t tr 0feh tc 11111110b v thanh ghi a.SETB C ; t bit Cary ln mc 1.LOOP: MOV P1,A ; Chuyn ni dung trong thanh ghi a vo cng port 1.LCALL DELAY ; Cho gi chng trnh lm tr

RLC A ; Cho ni dung trong thanh ghi a quay qua tri c cho quay qua bit c C.DJNZ R2,LOOP ; m li tr trong thanh ghi r2. Nu cha bng 0 th lm tip lnh LOOP.MOV R2,#8 ; Np li tr 8 vo thanh ghi r2.LOOP1: MOV P1,A ; Chuyn ni dung trong thanh ghi a vo cng port 1.LCALL DELAY ; Cho gi chng trnh lm trRRC A ; Cho ni dung trong thanh ghi a quay qua phi c cho quay qua bit c C.DJNZ R2,LOOP1 ; m li tr trong thanh ghi r2. Nu cha bng 0 th lm tip lnh LOOP1.


18/37

LJMP START ; Nhy khng iu kin v tn nhn start li tip tc.DELAY: MOV R5,#20 ; Chng trnh dng lm tr (xem li phn th d 1)D1: MOV R6,#20D2: MOV R7,#248DJNZ R7,$

DJNZ R6,D2DJNZ R5,D1RETEND ; Dng bin dch.


Bi ny dng lnh quay bit qua phi v ri cho quay bit qua tri di bit 0 ln lt i qua 8chn ca port 1, chng ta bit bit 0 s lm sng Led. Nh vy Bn s thy cc Led trn port 1 sln lt sng v nhy qua phi ri i chiu nhy qua tri. bit 0 c th i trn 8 chn ca

port 1, chng ta dng lnh quay c quay qua bit c C (rrl v rlc), d nhin trc phi nh setbit c C ln mc 1.

Trnh by lnh quay rrc v rlc bng hnh minh ha (Bn xem hnh):

a- Bn dng lnh quay c qua c C, vy qua 8 nhp bit 0 s vo nm trong c C, lc ny 8 bit port 1 u mc 1 v nh vy 8 Led trn port 1 u s tt. Vi lnh rlc a (rotate left Carry). Bns thy tng Led sng ln v nhy qua bn tri.

b- Bn dng lnh quay c qua c C, vy qua 8 nhp bit 0 s vo nm trong c C, lc ny 8 bit port 1 u mc 1 v nh vy 8 Led trn port 1 u s tt. Vi lnh rrc a (rotate right Carry).

Bn s thy tng Led sng ln v nhy qua bn phi.


19/37

c- Lnh quay (rotate) ch c tc dng vi thanh ghi a, do Bn mun th hin kt qu ra 8 Ledtrn port 1, Bn phi chuyn ni dung c trong a ra port 1. Bn dng lnh mov p1, a.

Tm li, trong bi ny Bn lm quen vi cch dng lnh quay c cho qua c C. Vi cch vitny, Bn thy chng ta dng rt t cu lnh m vn khin cho cc Led sng nhy (nhy qua nhyli) trn port 1.

Bi 5: Vit chng trnh mch pht ra ting cnh bo.Tn hiu 1KHz v 500Hz pht ra trn chn 1 (p1.0), thi gian pht tn hiu 1KHz l 100ms vthi gian pht tn hiu 500Hz l 200ms.

Kha in trn chn 8 (p1.7) dng tt m tn hiu cnh bo.


20/37

FLAG BIT 00h ; nh ngh Flag dng lm bit c, hin c tr l 0.ORG 0000HSTART: JB P1.7,START ; Ch t nt K1 t xung mc 0.JNB FLAG,NEXT ; Nu bit c Flag l 0 th nhy n tn nhn NEXT.MOV R2,#200 ; Np s thp phn 200 vo thanh ghi r2.DV: CPL P1.0 ; Ly b chn p1.0, lnh b bit c chc nng t o.LCALL DELY500 ; Cho gi chng trnh lm tr 500us.LCALL DELY500 ; gi ln na chng trnh dely500.DJNZ R2,DV ; Cho m li v thc hin lnh b cpl p1.0 n 200 ln.CPL FLAG ; o bit trong c Flag.NEXT: MOV R2,#200 ; Np li s thp phn 200 vo thanh ghi r2.DV1: CPL P1.0 ; Ly b chn p1.0, c chc nng t o.LCALL DELY500 ; Cho gi chng trnh lm tr 500us.DJNZ R2,DV1 ; Cho m li v thc hin b cpl p1.0 n 200 ln.CPL FLAG ; Li cho o bit trong c Flag.


21/37

SJMP START ; Lp li lnh t tn nhn START.DELY500: MOV R7,#250 ; Vit chng trnh con lm tr 500us. Np s 250 v thanh ghi r7.LOOP: NOP ; Lnh trng, dng n lm tng thi gian tr ln gp i.DJNZ R7,LOOP ; m li r7 lm tr.RET ; Cho quay li thc hin dng lnh sau lnh call.

END ; Dng bin dch


Trong bi ny, Bn thy dng khai bo bit nh ngha tn t t ca Bn, nh:

flag BIT 0 ; Ch flag do Bn t t l mt BIT, hin c gi tr l bit 0.

Bn dng lnh nhy theo bit kim tra kha in K1.

start: jb p1.7, start ; Lnh ny s ch chn p1.7 xung bit 0, nu khng n s lun dng li y.

cpl p1.0 ; Lnh ly b trn chn p1.0, ngha l n ang mc 0 th cho chuyn ln 1 v ngcli.

Phn tch cc cu lnh trn Bn thy:

Loa s h vi tn hiu 1000us (do 2 ln gi dely500) v ko di 200 ln ri chuyn qua h vi tnhiu 500us (do ch gi dely500 c 1 ln) cng thc hin 200 ln. Vi cch to ra tn hiu h 2nhp ny, Bn s nghe ting h t Loa pht ra, tn hiu nghe nh ting ci h cnh bo..

Bi 6: Vit chng trnh dng cch ly d liu khai bo trong bng, tt m 8 Led trn port 1.

* Nhy nhy qua tri 2 ln.

* Nhy nhy qua phi 2 ln.

* Ton phn nhp nhy 2 ln.(Thi gian tr 0.2 giy).


22/37

ORG 0000hSTART: MOV DPTR,#TABLE ; Lnh cho t a ch bng vo thanh ghi con tr.LOOP: CLR A ; cho xa ni dung trong thanh ghi a, lc ny a = 00000000bMOVC A,@A+DPTR ; Cho ly ni dung trong bng theo tr trong a, v cho ct kt qu vo a.CJNE A,#01H,LOOP1 ; Nu a cha bng 01h th nhy qua tn nhn LOOP1.JMP START ; Nu trong a bng 01h th nhy v tn nhn START.

LOOP1: MOV P1,A ; Chuyn ni dung trong a ra trn cng port 1.MOV R3,#20 ; Np s thp phn 20 vo thanh ghi r3.LCALL DELAY ; Gi chng trnh lm tr, tn nhn l delay.INC DPTR ; cho tng a ch bng ln +1.JMP LOOP ; Nhy v tn nhn LOOP.DELAY: MOV R4,#20 ; Vit chng trnh con dng lm tr, tn nhn l delayD1: MOV R5,#248 ; Np tr thp phn 248 vo r5.


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DJNZ R5,$ ; Cho gim theo bc -1, ch r5 bng 0.DJNZ R4,D1 ; Cho r4 gim theo bc -1, cha bng 0, nhy v D1.DJNZ R3,DELAY ; Cho r3 gim theo bc -1, cha bng 0, nhy v DELAY.RET ; Quay li chy cu lnh nm sau lnh call.

TABLE: DB 0FEH,0FDH,0FBH,0F7H ; Khai bo cc d liu t trong bng, tn bng lTABLE.DB 0EFH,0DFH,0BFH,07FH ; cc d liu ln lt sp trong bng.DB 0FEH,0FDH,0FBH,0F7H ; cc d liu ln lt sp trong bng.DB 0EFH,0DFH,0BFH,07FH ; cc d liu ln lt sp trong bng.DB 07FH,0BFH,0DFH,0EFH ; cc d liu ln lt sp trong bng.DB 0F7H,0FBH,0FDH,0FEH ; cc d liu ln lt sp trong bng.DB 07FH,0BFH,0DFH,0EFH ; cc d liu ln lt sp trong bng.DB 0F7H,0FBH,0FDH,0FEH ; cc d liu ln lt sp trong bng.DB 00H, 0FFH,00H, 0FFH ; cc d liu ln lt sp trong bng.DB 01H ; D liu dng soa snh nhy (Xem cu lnh trn).

END ; Dng bin dch ti y.


Trong bi ny, chng ta cho ly d liu lit k trong bng lm sng cc Led trn port 1. Trnht lm nh sau:

Trc ht Bn chn cch lm sng tt cho 8 Led trn port 1 vi m 0/1. Chng ta nh bit 0 lmLed sng v bit 1 s lm Led tt. Th d: Mun Led sng nhy qua tri, chng ta s chn m iu

khin nh sau:

11111110b i ra dng m h 16 s l 0FEH.

11111101b i ra dng m h 16 s l 0FDH.11111011b i ra dng m h 16 s l 0FBH.11110111b i ra dng m h 16 s l 0F7H.11101111b i ra dng m h 16 s l 0EFH.

11011111b i ra dng m h 16 s l 0DFH.10111111b i ra dng m h 16 s l 0BFH.

01111111b i ra dng m h 16 s l 07FH.Bn c lit k ra trong bng. Sau ny s dng lnh: movc a, @a + dptr. ly cc m ny ctvo a. ngha ca cu lnh ny nh sau:

Nu khi u a=0 th n s ly m d liu u trong bng v ri ct vo thanh ghia.Bn dng lnh inc dptr d cho tr trong a tng ln +1.


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Vy khi dng cu lnh: movc a, @a +dptr, Bn s cho ly m d liu tip theo...

Sau mi ln ly d liu t bng ra, Bn dng cu lnh nhy theo php so snh: cjne a, #01h,loop1 xem ly n m d liu cui cng cha, v Bn t m 01H cui bng.

Ghi nhn: Dng cch vit ny, Bn rt d chn cc kiu nhp nhy cho cc Led trn port 1. Bnch cn khai bo cc m iu khin trong bng l c. bn c th khai bo theo dng m nhphn cho d nhn thy s sng tt ca cc Led.

Bi 7: Vit chng trnh trn n s dng Led 7 on ln lt xut hin cc con s 0, 1, 2,3...Thi gian thay i s l 0.2s.

Ch : Dng loi n s Led 7 on c Cathode chung, vy Led sng vi mc 1.


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hin cc s thp lc phn trn n s 7 on vi chn cathode (K) m cc s s nh sau:

0 hay 3 FH1 hay 06H2 hay 5BH3 hay 4FH4 hay 66H5 hay 6DH6 hay 7DH7 hay 07H8 hay 7FH9 hay 6FHA hay 77H

b hay 7CHC hay 39Hd hay 5EHE hay 79HF hay 71H

Do vy to ra bng hin th cc s thp phn, chng ta s vit nh sau:TABLEDB3FH06H5BH4FH66H6DH7DH07H7FH6FH

ORG 0000h

START: MOV R1,#00H ; t tr khi u 0 cho thanh ghi r1NEXT: MOV A,R1 ; Cho chuyn ni dung trong r1 vo a.MOV DPTR,#TABLE ; t a ch ca bng vo thanh ghi con tr dptr.MOVC A,@A+DPTR ; Ly cc m d liu trong bng theo tr ca a v d liu ct vo a.MOV P2,A ; Xut d liu trong a ra port 2 cho hin s.LCALL DELAY ; Cho gi chng trnh lm tr, tn nhn l delay.INC R1 ; Cho tng tr trong r1 theo kiu +1.CJNE R1,#10,NEXT ; So snh tr trong r1, xem bng 10 cha? cha, nhy v NEXT.LJMP START ; Lnh nhy khng iu kin v cu lnh c tn nhn l START.DELAY: MOV R5,#20 ; Vit chng trnh lm tr. Bn xem li cc phn th d trn.D2: MOV R6,#20

D1: MOV R7,#248DJNZ R7,$DJNZ R6,D1DJNZ R5,D2RETTABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH ; Bng m cho hin cc s thpphn.


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END ; Dng bin dch.

Ni r hn v loi n hin s dng Led 7 on (Bn xem hnh):

Khi chn trn port 2 mc p cao, th Led tng ng s pht sng. Vy chng ta c th t m trn n Led 7 on ln lt hin ra cc con s thp phn.

Hnh cho thy cc m tng ng vi cc con s thp phn hin trn bng n s dng Led 7on.


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Bi 8: Vit mch m s hin thi theo h c 2 vi 4 Led trn cc chn 1 (p1.0), 2 (p1.1), 3(p1.2), 4 (p1.3). Mi ln nhn kha in SP1 trn chn 17 (p3.7) th s tng ln +1.


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ORG 0000h

START: MOV R1,#00H ; Cho khi u vi tr 0 trong thanh ghi r1.MOV A,R1 ; chuyn ni dung trong r1 vo a.CPL A ; Ly b 8 bit trong thanh ghi a.MOV P1,A ; Xut ni dung trong a ra cng port 1.REL: JNB P3.7,REL ; Ch bun phm nhn chn p3.7.LCALL DELAY10MS ; Gi chng trnh con lm tr 10ms.JNB P3.7,REL ; Trnh nh hng ca rung phm.INC R1 ; Cho tng tr trong thanh ghi r1MOV A,R1 ; Cho chuyn ni dung trong r1 vo a.CPL A ; Ly b 8 bit trong thanh ghi aMOV P1,A ; Xut ni dung trong a ra cng port 1.

JNB P3.7,$ ; Ch bung phm SP1SJMP REL ; Nhy khng iu kin v dng lnh tn nhn l RELDELAY10MS: MOV R6,#20 ; Vit chng trnh lm tr 10msL1: MOV R7,#248DJNZ R7,$DJNZ R6,L1RET


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END ; Dng bin dch ti dng ny.


Ni dung bi vit l c nhn mt ln phm SP1, mch m s h c 2 s nhy ln 1 s (Bn xemhnh).

y c 2 cu hi, ti hi Bn:

(1) Vn rung phm l g?

(2) Ti sao phi ly b a ri mi cho xut trn cng port1?

Vn rung phm l do phn tip xc xu, khi Bn nhn xung, phm s b rung, n ngt mnhiu ln v to ra kt qu sai. Do vy Bn phi vit on chng trnh ch 10ms ri mi xc lptrng hi ca phm, iu ny s tng n nh khi dng loi phm c kh. Cch vit nh sau:


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REL: JNB P3.7,REL

; Khi bn nhn xung, nu phm tt, n s bit 0 v s trng thi ch bung phm. Nu c rung

phm, n s nhy xung cu lnh di l cho gi chng trnh tr 10ms.

LCALL DELAY10MS ; Gi chng trnh con lm tr 10ms.

; Sau chng trnh tr n s quay li li kim tra phm vi cu lnh: JNB P3.7,REL

Nu n bit 0 th quay li REL v li ch bung phm. Ch khi n Bit 1 th mi cho tng trtrong r1.

..... .

JNB P3.7,$

; Cu lnh ny l nhy tai ch khi Bn cha b phm nhn SP1 ra.

Tr li cu hi th 2: Ti sao phi ly b a (cpl a) ri mi cho xut ra trn cng port1.

y chng ta kch Led bng mc p thp, do khi tng 1, n s l:

00000000b --> 00000001b Vy phi ly b ca n s l 11111110b iu ny s ch c Led p1.0 sng m thi n ng vi 1 ln nhn phm.

Nu 2 ln nhn phm kt qu l:

00000010b --> ly b l 11111101b. Vy Led p1.1 s sng. Bn c l lun tip tc s thymch ny dng m h c 2, kt qu cho hin th trn cc Led ca port 1.

v nu Bn thy thch, Bn c th gn 8 Led trn port 1 v s thy hin tng trng s. Thanhghi 8 bit ch m c 256 nhp s trang s, quay v 0 v bt u m tip...


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Bi 9: Vit chng trnh , mi ln nhn kha in SP1 trn chn 17 (p3.7) th Led D1trn chn 1 (p1.0), nhp nhy. Khi nhn SP1 ln na n Led D2 trn chn 2 nhp nhy,nhn SP1 ln na n Led D3 trn chn 3 nhp nhy v nhn SP1 ln na th n Led D4trn chn 4 nhp nhy, v qui trnh tip tc lp li nh trn.


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ID EQU 30H ; Ly thanh nh c a ch 30h nh ngha l thanh ID.K1 BIT P3.7 ; Chn p3.7 nh ngha vi tn l K1L1 BIT P1.0 ; Chn p1.0 nh ngha vi tn l L1.L2 BIT P1.1 ; Chn p1.1 nh ngha vi tn l L2.L3 BIT P1.2 ; Chn p1.2 nh ngha vi tn l L3.L4 BIT P1.3 ; Chn p1.3 nh ngha vi tn l L4.ORG 0000hMOV ID,#00H ; Tr khi u ca ID l 0.START: JB K1,REL ; Cha nhn phm th nhy n tn nhn REL.LCALL DELAY10MS ; Gi chng trnh lm tr 10ms (trnh rung phm).

JB K1,REL ; Cha nhn phm th nhy n tn nhn REL.INC ID ; Tng tr trong ID.MOV A,ID ; Cho chuyn ni dung trong ID v thanh ghi a.CJNE A,#04,REL ; Cho so snh a vi #04 pht hin s ln nhn K1MOV ID,#00H ; Tr tr trong ID v tr o.REL: JNB K1,$ ; Ch bung phm K1MOV A,ID ; Cho chuyn ni dung trong ID v thanh ghi a.


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CJNE A,#00H,IS0 ; Cho so snh a vi #00 pht hin s ln nhn K1CPL L1 ; Ly b L1 tt/m Led D1LCALL DELAY ; Gi chng trnh lm tr vi tn nhn l delay.SJMP START ; Nhy khng iu kin v tn nhn STARTIS0: CJNE A,#01H,IS1 ; Cho so snh a vi #01 pht hin s ln nhn K1

CPL L2 ; Ly b L2 tt/m Led D2LCALL DELAY ; Gi chng trnh lm tr vi tn nhn l delay.SJMP START ; Nhy khng iu kin v tn nhn STARTIS1: CJNE A,#02H,IS2 ; Cho so snh a vi #02 pht hin s ln nhn K1CPL L3 ; Ly b L3 tt/m Led D3LCALL DELAY ; Gi chng trnh lm tr vi tn nhn l delay.SJMP START ; Nhy khng iu kin v tn nhn STARTIS2: CJNE A,#03H,IS3 ; Cho so snh a vi #03 pht hin s ln nhn K1CPL L4 ; Ly b L4 tt/m Led D4LCALL DELAY ; Gi chng trnh lm tr vi tn nhn l delay.SJMP START ; Nhy khng iu kin v tn nhn START

IS3: LJMP START ; Nhy khng iu kin v tn nhn START

DELAY10MS: MOV R6,#20 ; Chng trnh lm trLOOP1: MOV R7,#248DJNZ R7,$DJNZ R6,LOOP1RETDELAY: MOV R5,#20LOOP2: LCALL DELAY10MSDJNZ R5,LOOP2RET

END ; Dng bin dch ti y.


Bn hy ch n lnh so snh c iu kin, dng pht hin cc m trng nhau hay khcnhau v t a ra hng s l vn . Th d:

CJNE A,#00H,IS0

; Cho so snh a vi s #00, nu khc th nhy n tn nhn IS0, nu ng th xung thi hnhdng lnh bn di.

CPL L1 ; Ly b L1 tt/m Led D1.

LCALL DELAY ; Gi chng trnh lm tr vi tn nhn l delay.

SJMP START ; Nhy khng iu kin v tn nhn START.


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Bi 10: Vit chng trnh mch m s ln nhn phm SP1 trn chn 17 (p3.7), kt qu hinth trn n s dng Led 7 on. S m bt u t 00, 01, 02,...99.

Count EQU 30H ; t tn thanh ghi 8 bit 30h l Count.SP1 BIT P3.7 ; t tn bit p3.7 l SP1.

ORG 0000h ; Bt u t thanh ghi Reset 0000hSTART: MOV Count,#00H ; t Count v mc khi u l s 0.NEXT: MOV A,Count ; Cho chuyn ni dung trong Count vo thanh ghi a.MOV B,#10 ; t s 10 vo thanh ghi b.DIV AB ; Cho s trong a chia cho 10 (s trong b).MOV DPTR,#TABLE ; t a ch ca bng c tn l Table vo thanh ghi con tr.MOVC A,@A+DPTR ; Ly s t bng theo tr c trong a v kt qu gi trong a.


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MOV P1,A ; Cho xut ni dung trong a ra port 1.MOV A,B ; By gi cho chuyn ni dung trong thanh ghi b vo a.MOVC A,@A+DPTR ; Li ly s t bng theo tr c trong a v kt qu gi trong a.MOV P2,A ; Cho xut ni dung trong a ra port 2.WT: JNB SP1,WT ; Ch bung phm SP1.

WAIT: JB SP1,WAIT ; Ch nhn phm SP1.LCALL DELY10MS ; Gi chng trnh tr 10ms, trnh hin tng rung phm.JB SP1,WAIT ; Kim tra bung phmINC Count ; Tng ni dung trong Count ln theo bc +1.MOV A,Count ; Cho chuyn ni dung trong Count vo thanh ghi a.CJNE A,#100,NEXT ; So snh tr trong a bng 100 cha? Nu cha th tip tc.LJMP START ; Quay li t u.DELY10MS: MOV R6,#20 ; Lm tr 10ms trnh nh hng ca rung phm.D1: MOV R7,#248DJNZ R7,$DJNZ R6,D1

RETTABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH ; Bng m s dng cho Led 7on.END ; Dng bin dch ti dng ny.


Trong on chng trnh trn, chng ta c dng n lnh lm php ton chia: div ab

Bn ly s c trong a chia cho b. Kt qua s chia c trong a v s d c trong b. chia a cho

10, Bn phi np vo thanh ghi b tr 10 vi cu lnh: mov b, #10.

Bn ch n trnh lm tr 10ms, y dng trnh nh hng c sai do rung phm, v mikhi Bn nhn phm, trong khong thi gian ngn phm b rung v to ra s ghi nhn sai.

Dng cu lnh so snh (cjne: Compare Jump iu kin Non-Zero) kim tra tr trong thanh ghia. y l mt cu lnh rt thng dng.Ngun Guests cannot see links in the messages. Please register to forum by clicking here to see

links.

C th lin quan n ch Lp trnh a nhim vi 8051Mch AT89C51 dng 32 phm gn trn ma trn 8x4Hc lp trnh C cho VK 8051 bng cc v diu khin ng c bng L298 + 89C51THIT K MCH QUANG BO DNG VI IU KHIN[Help]Thit k h thng iu khin t xa cho cc thit b gia nh bng 8051
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Lun vn: Thit k - thi cng Kit Vi iu khn 8051Mch m sn phm dng vi iu khin 89C51hepl me!. xin gip gii vi iu khinH thng iu khin ca t ng

10-05-2013, 07:12 AMBi vit: #2

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RE: 10 chng trnh cho vi iu khin AT89C51

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