Question 6.12: Write a program to transfer value 41H serially (one bit at a...

The 8051 Microcontroller and Embedded Systems

Write a program to transfer value 41H serially (one bit at a time) via pin P2.1. Put two highs at the start and end of the data. Send the byte LSB first.

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Question: 6.8

Show how the 8051 would represent -34H ...

Verified Answer:

1. 0011 0100 34H given in binary 2. ...

Question: 6.7

(a) Write a program to get hex data in the range of 00 – FFH from port 1 and convert it to decimal. Save it in R7, R6 and R5. (b) Assuming that P1 has a value of FDH for data, analyze program. ...

Verified Answer:

(a) MOV A,#0FFH MOV P1,A ...

Question: 6.10

Read and test P1 to see whether it has the value 45H. If it does, send 99H to P2; otherwise, it stays cleared. ...

Verified Answer:

MOV P2,#00 ;clear P2 MOV P1,#0FFH ;...

Question: 6.18

Assume that we have 4 bytes of hexadecimal data: 25H, 62H, 3FH, and 52H.(a) Find the checksum byte, (b) perform the checksum operation to ensure data integrity, and (c) if the second byte 62H has been changed to 22H, show how checksum detects the error. ...

Verified Answer:

(a) Find the checksum byte.

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Question: 6.17

Assume that the lower three bits of P1 are connected to three switches. Write a program to send the following ASCII characters to P2 based on the status of the switches. 000 ‘0’ 001 ‘1’ 010 ‘2’ 011 ‘3’ 100 ‘4’ 101 ‘5’ 110 ‘6’ 111 ‘7’ ...

Verified Answer:

MOV DPTR,#MYTABLE MOV A,P1 ...

Question: 6.16

(a) Find the contents of register A in the following code. (b) In the absence of a SWAP instruction, how would you exchange the nibbles? Write a simple program to show the process. ...

Verified Answer:

(a) MOV A,#72H ;A = 72H SWAP A ...

Question: 6.15

Write a program that finds the number of 1s in a given byte. ...

Verified Answer:

MOV R1,#0 ;R1 keeps number of 1s MOV...

Question: 6.14

Assume that bit P2.2 is used to control an outdoor light and bit P2.5 a light inside a building. Show how to turn on the outside light and turn off the inside one. ...

Verified Answer:

SETB C ;CY = 1 ORL C,P2.2 ...

Question: 6.13

Write a program to bring in a byte of data serially one bit at a time via pin P2.7 and save it in register R2. The byte comes in with the LSB first. ...

Verified Answer:

MOV R5,#8 AGAIN: MOV C,P2.7 ;...

Question: 6.9

Examine the following code and analyze the result. MOV A,#+96 ;A=0110 0000 (A=60H) MOV R1,#+70 ;R1=0100 0110(R1=46H) ADD A,R1 ;A=1010 0110 ;A=A6H=-90,INVALID ...

Verified Answer:

\begin{array}{r c}\begin{matrix} \\ + \\ + ...