Generate Down Going Staircase wave form ALP

Program Name

Write a Assembly Language Program for Generate Down Going Staircase wave form .

Theory

Instruction Mnemonic	Operand	Comments
MVI	A,80H	Load Accumulator with immediate data 80H.
OUT	CWR	Send content of Accumulator to Control Word Register.
MVI	A,FF	Load initial count.
OUT	P A	Send data to port A.
OUT	PB	Send data to port B.
CALL	DLY	Call delay subroutine.
SUI	33H	Subtract immediately from Accumulator.
CPI	FFH	Compare content of Accumulator with max (FF) count.
JNZ	XY	jump to XY if result of previous operation is not equal to zero.
JMP	YZ	Jump to YZ to repeat the process.

Delay Code

Instruction Mnemonic	Operand	Comments
MVI	B,FF	Load register B with FF.
DCR	B	Decrement count value.
JNZ	YY	Jump to YY if result of previous operation is not equal to zero.
RET		Return to main program.

Program Code


MVI	A,80H
OUT	CWR
MVI	A,FF
OUT	PA
OUT	PB
CALL	DLY
SUI	33H
CPI	FFH
JNZ	XY
JMP	YZ


//Delay Code
MVI	B,FF
DCR	B
JNZ	YY
RET

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