Assembly Language-part1

Please refer to slides and Primer boards lessons

1. If the switch S₇ of the input PORT0 connected to the data line D₇ is at logic 1 and the other switches are at logic 0, specify the contents of the accumulator when the instruction IN PORT0 is executed.

MVI A,9FH

IN PORT0

MOV B,A

OUT PORT1

HLT

2. Specify the output at PORT1 and the contents of the register B after executing the instructions in Problem #1.

 

3. Specify the register contents and the flag status as the following instructions are executed.

	A	C	S	Z	CY
	XX	XX	0	0	0
MVI A,5EH
ADI A2H
MOV C,A

 

4. Specify the register contents and the flag status as the following instructions are executed.

	A	B	S	Z	CY
	XX	XX	X	X	X
SUB A
MOV B,A
DCR B
INR B
SUI 01H

5. Write a program to
   1. clear the accumulator
   2. add 47H (use ADI instruction)
   3. subtract 92H
   4. add 64H
   5. display the results after subtracting 92H and after adding 64H

 

6. Specify the register contents and the flag status as the following instructions are executed

	A	B	S	Z	CY
	XX	XX	0	0	0
XRA A
MVI B,4AH
SUI 4FH
ANA B

 

 

7. What is the output at PORT1 when the following instructions are executed?

MVI A,8FH

ADI 72H

JC DSPLAY

OUT PORT1

HLT

DSPLAY:  XRA A

OUT PORT1

HLT

 

Answers.

1. The data on A after the instruction IN PORT0 is executed will be the same as the data read on PORT0. Thus, the data on A will be equal to 80H.
2. The data on register A will be copied to register B. So, the data on register B will be 80H. After the instruction OUT PORT1, the data on Register A will be outputted in PORT1. Thus, PORT1 would also show 80H or 1000 0000.

 

 

 

	A	C	S	Z	CY
	XX	XX	0	0	0
MVI A,5EH	5EH	xx	0	0	0
ADI A2H	00H	xx	0	1	1
MOV C,A	00H	00H	0	1	1

 

	A	B	S	Z	CY
	XX	XX	X	X	X
SUB A	00H	XX	0	1	0
MOV B,A	00H	00H	0	1	0
DCR B	00H	FFH	1	0	1
INR B	00H	00H	0	1	0
SUI 01H	FFH	00H	1	0	1

SUB A

ADI 47H

SUI 92H

OUT PORT0

ADI 64H

OUT PORT0

HLT

 

 

	A	B	S	Z	CY
	XX	XX	0	0	0
XRA A	00H	XX	0	1	0
MVI B,4AH	00H	4AH	0	1	0
SUI 4FH	C0H	4AH	1	0	1
ANA B	40H	4AH	0	0	0

 

7. The Carry flag will be set after the instruction ADI 72H, so when the JC DISPLAY is executed it will jump to DISPLAY. XRA A will reset the accumulator. Thus, the output in PORT1 will be 00H.
   

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