timer2.s

protues_atmeg8学习之：timer篇源代码

	.module Timer2.C
	.area text(rom, con, rel)
	.dbfile F:\Learn\AVR\Pro_Mega8\Timer\Timer2CTC/Delay.h
	.dbfunc e delay_1ms _delay_1ms fV
;              i -> R16,R17
	.even
_delay_1ms::
	.dbline -1
	.dbline 3
; /******************************************/
; //文件名：Timer2CTC.c
; //功能： T/C2的CTC模式的应用
	.dbline 5
; //作者:  young
; //时间： 2006.10.9
	ldi R16,1
	ldi R17,0
	rjmp L5
L2:
	.dbline 6
L3:
	.dbline 5
	subi R16,255  ; offset = 1
	sbci R17,255
L5:
	.dbline 5
	cpi R16,118
	ldi R30,4
	cpc R17,R30
	brlo L2
	.dbline -2
	.dbline 7
; //目标MCU:ATmega8   
; //晶振:  8MHZ
L1:
	.dbline 0 ; func end
	ret
	.dbsym r i 16 i
	.dbend
	.dbfunc e delay_ms _delay_ms fV
;              i -> R20,R21
;              n -> R22,R23
	.even
_delay_ms::
	rcall push_gset2
	movw R22,R16
	.dbline -1
	.dbline 11
; /******************************************/
; #include <iom8v.h>
; #include <macros.h>
; #include "Delay.h"
	.dbline 12
; 
	clr R20
	clr R21
	rjmp L8
L7:
	.dbline 14
	.dbline 15
	rcall _delay_1ms
	.dbline 16
	subi R20,255  ; offset = 1
	sbci R21,255
	.dbline 17
L8:
	.dbline 13
; //初始化端口
	cp R20,R22
	cpc R21,R23
	brlo L7
	.dbline -2
	.dbline 18
; void init_port(void)  
; {   
;     DDRB  = 0x08; //OC2(PB3)设为输出
;     PORTB = 0xFF;
;     PORTC = 0x00;
L6:
	rcall pop_gset2
	.dbline 0 ; func end
	ret
	.dbsym r i 20 i
	.dbsym r n 22 i
	.dbend
	.dbfile F:\Learn\AVR\Pro_Mega8\Timer\Timer2CTC\Timer2.C
	.dbfunc e init_port _init_port fV
	.even
_init_port::
	.dbline -1
	.dbline 15
	.dbline 16
	ldi R24,8
	out 0x17,R24
	.dbline 17
	ldi R24,255
	out 0x18,R24
	.dbline 18
	clr R2
	out 0x15,R2
	.dbline 19
;     DDRC  = 0xFF;
	out 0x14,R24
	.dbline 20
;     PORTD = 0x00;
	out 0x12,R2
	.dbline 21
;     DDRD |= 0xFF;
	in R24,0x11
	ori R24,255
	out 0x11,R24
	.dbline -2
	.dbline 22
; }  
L10:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e init_timer2 _init_timer2 fV
	.even
_init_timer2::
	.dbline -1
	.dbline 26
; 
; //初始化T/C2
; void init_timer2(void)  
; {     
	.dbline 27
;     TCCR2 = 0x00;     //T/C2工作于定时方式，先停止T/C2 
	clr R2
	out 0x25,R2
	.dbline 28
;     TCNT2 = 0x00;     //计数初始值0
	out 0x24,R2
	.dbline 29
;     OCR2  = 0xFD;     //设置比较参考值		
	ldi R24,253
	out 0x23,R24
	.dbline 30
;     TIMSK|= 0x80;     //打开TOV2的比较匹配中断	
	in R24,0x39
	ori R24,128
	out 0x39,R24
	.dbline 34
; 	//T/C2工作于定时方式CTC（WGM2[1:0]=2），
; 	//比较匹配时触发OC2取反（COM2[1:0]=1）,
; 	//系统时钟256分频(CS2[2:0]=0xC)
; 	TCCR2|= (1<<WGM21)|(1<<COM20)|(1<<CS22)|(1<<CS21);
	in R24,0x25
	ori R24,30
	out 0x25,R24
	.dbline -2
	.dbline 35
; }  
L11:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e init_devices _init_devices fV
	.even
_init_devices::
	.dbline -1
	.dbline 39
; 
; //初始化所以硬件 
; void init_devices(void)  
; {
	.dbline 40
;     CLI();          //关闭全局中断
	cli
	.dbline 41
;     init_port();	    
	rcall _init_port
	.dbline 42
;     init_timer2();
	rcall _init_timer2
	.dbline 43
;     SEI();          //打开全局中断
	sei
	.dbline -2
	.dbline 44
; } 
L12:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e main _main fV
	.even
_main::
	.dbline -1
	.dbline 48
; 
; //主函数
; void main(void)  
; {
	.dbline 49
;     init_devices();  
	rcall _init_devices
L14:
	.dbline 51
	.dbline 52
	.dbline 53
L15:
	.dbline 50
	rjmp L14
X0:
	.dbline -2
	.dbline 54
;     while(1) 
;     { 
;         ;
;     }  
; } 
L13:
	.dbline 0 ; func end
	ret
	.dbend