sg12.asm

the practice of proteus and avr

.device AT90S8535
.equ    sph    	=$3E
.equ    spl    	=$3D
.equ	PORTD	=$12
.equ	DDRD	=$11
.equ    PIND    =$10
.equ    TIMSK   =$39
.equ    OCR1BH  =$29
.equ    OCR1BL  =$28
.equ    TCCR1A  =$2F
.equ    TCCR1B  =$2E

	.org	$0000
	rjmp	main

main:	ldi	r16,$02			;栈指针置初值
	out	sph,r16
	ldi	r16,$5f
	out	spl,r16
	ldi	r16,$03			;8分频
	out	TCCR1B,r16
	ldi	r16,$23			;OC1B口10位正向PWM输出
	out	TCCR1A,r16
	sbi	DDRD,4			;PD4(OC1B)引脚定义为输出
	ldi	r18,0			;设占空比为$200/$3FF
	ldi	r19,2
	out	OCR1BH,r19
	out	OCR1BL,r18

here:	rjmp	here