7/29/2019 01 Unit 7 Assign
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Jeff Brown
M icroprocessing
M r. Hamza
08-01-13
Unit 7 Homework assignment Problems
Chapter 10: Problems 1-16, 22, 25, 27, 29-36, 40-43, 45, 46, 52,
53, 62, 63, 64, 65
1. ) Which is more expensive: Parallel
2. ) False, they must be converted.
3. ) ASCII Z is: 1010110100 ---> this start bit goes
first
4. ) Data Transfer and Line is high, it is called - Mark
5. ) True. It can be 1 or 2.
7. ) False, the RS232 is TTL Compatable
8. ) The MAX chip makes the RS232 standard compatible with TTL
logic.
9. ) False
10. ) Answer is: 9 pins are used, because the rest arent used in
the data transfer.
11. ) False, the longer the cable the lower the baud rate.
12. ) 3 is the min. number of signals. The signals are: TxD,
RxD, & Gnd
13. ) Configured as a DTE to: DTE
22. ) MAX233is Expensive & doesnt need an external capacitor
connected.
25. ) Pin Number 25, TxD [RC6], Pin 26, RxD [RC7]
30. ) None of the 8051 is used for baud rate programming because
it has its own Timer.
32. ) The role of the SBUF register in serial transfer is to
send a byte serially.
Plus, it must be placed in the TXREG register.
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33. ) SBUF is an 8 bit register
34. ) Role of the SCON register in serial transfer is to do the
framing of the data.
35. ) SCON is an8 bit register.
40. ) The flag is raised when a byte of data is sent & TXREG
register is emptied out. It is
then cleared with a new byte written into the TXREG.
42. )
43. )
46. ) The SMOD bit is Low when the 8051 is turned on.
53. ) Mode 2 is used for baud rate programming of the 2nd
serial port.
