Z80 Programming
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Z80 5seconds Timer for 10MHz



	...	...
MAIN:	CALL	TIMER5
	...	...


TIMER5:	LD	E,35H
J60:	LD	B,0FFH
J61:	LD	D,0FFH
J62:	DEC	D
	JP	NZ,J62
	DEC	B
	JP	NZ,J61
	DEC	E
	JP	NZ,J60
	RET





Z80  multivibrator

Point: Use Loop Output 00H and FFH at 1 second interval.

	ORG	0000H
	LD	SP,0FFFFH

PPI1	EQU	37H
PORTB1	EQU	35H

	LD	A,90H
	OUT	(PPI1),A

LOOP:	LD	A,0
	OUT	(PORTB1),A
	CALL	TIMER1
	LD	A,0FFH
	OUT	(PORTB1),A
	CALL	TIMER1
	JP	LOOP

TIMER1:	LD	E,0AH	
J50:	LD	B,0FFH
J51:	LD	D,0FFH
J52:	DEC	D
	JP	NZ,J52
	DEC	B
	JP	NZ,J51
	DEC	E
	JP	NZ,J50
	RET

	END