sg14.asm

the practice of proteus and avr

.device AT90S8535
.equ    TCCR2   =$25
.equ    OCR2    =$23
.equ	PORTD	=$12		
.equ	DDRD	=$11

t2pwm1:	sbi	ddrd,7		;产生15686Hz的方波
	ldi	r16,$71		;PWM2使能，向上计数置引脚
	out	TCCR2,r16	;向下计数清引脚，时钟1分频
	ldi	r16,$80
	out	OCR2,r16
	ret