timer.src

C51单片机的C语言例程,可实现定时器中断及其时钟功能的源代码

; .\timer.SRC generated from: timer.c
; COMPILER INVOKED BY:
;        D:\KeilC51\C51\BIN\C51.EXE timer.c ROM(COMPACT) BROWSE DEFINE(evalboard) DEBUG OBJECTEXTEND LISTINCLUDE SYMBOLS SRC(.\timer.SRC)

$NOMOD51

NAME	TIMER

P0	DATA	080H
P1	DATA	090H
P2	DATA	0A0H
P3	DATA	0B0H
T0	BIT	0B0H.4
AC	BIT	0D0H.6
T1	BIT	0B0H.5
EA	BIT	0A8H.7
IE	DATA	0A8H
RD	BIT	0B0H.7
ES	BIT	0A8H.4
IP	DATA	0B8H
RI	BIT	098H.0
INT0	BIT	0B0H.2
CY	BIT	0D0H.7
TI	BIT	098H.1
INT1	BIT	0B0H.3
PS	BIT	0B8H.4
SP	DATA	081H
OV	BIT	0D0H.2
WR	BIT	0B0H.6
SBUF	DATA	099H
PCON	DATA	087H
SCON	DATA	098H
TMOD	DATA	089H
TCON	DATA	088H
IE0	BIT	088H.1
IE1	BIT	088H.3
B	DATA	0F0H
ACC	DATA	0E0H
ET0	BIT	0A8H.1
ET1	BIT	0A8H.3
TF0	BIT	088H.5
TF1	BIT	088H.7
RB8	BIT	098H.2
TH0	DATA	08CH
EX0	BIT	0A8H.0
IT0	BIT	088H.0
TH1	DATA	08DH
TB8	BIT	098H.3
EX1	BIT	0A8H.2
IT1	BIT	088H.2
P	BIT	0D0H.0
SM0	BIT	098H.7
TL0	DATA	08AH
SM1	BIT	098H.6
TL1	DATA	08BH
SM2	BIT	098H.5
PT0	BIT	0B8H.1
PT1	BIT	0B8H.3
RS0	BIT	0D0H.3
TR0	BIT	088H.4
RS1	BIT	0D0H.4
TR1	BIT	088H.6
PX0	BIT	0B8H.0
PX1	BIT	0B8H.2
DPH	DATA	083H
DPL	DATA	082H
REN	BIT	098H.4
RXD	BIT	0B0H.0
TXD	BIT	0B0H.1
F0	BIT	0D0H.5
PSW	DATA	0D0H
?PR?timer0_isr?TIMER SEGMENT CODE INBLOCK 
?PR?timer0_initialize?TIMER              SEGMENT CODE INBLOCK 
?PR?timer0_count?TIMER                   SEGMENT CODE INBLOCK 
?PR?_timer0_elapsed_count?TIMER          SEGMENT CODE INBLOCK 
?PR?_timer0_wait?TIMER                   SEGMENT CODE INBLOCK 
?XD?TIMER            SEGMENT XDATA 
?XD?timer0_count?TIMER                   SEGMENT XDATA OVERLAYABLE 
?XD?_timer0_wait?TIMER                   SEGMENT XDATA OVERLAYABLE 
	PUBLIC	_timer0_wait
	PUBLIC	_timer0_elapsed_count
	PUBLIC	timer0_count
	PUBLIC	timer0_initialize

	RSEG  ?XD?TIMER
    timer0_tick:   DS   2

	RSEG  ?XD?timer0_count?TIMER
          t?240:   DS   2

	RSEG  ?XD?_timer0_wait?TIMER
start_count?443:   DS   2
; #include "tdp.h"
; #include <reg51.h>
; #define TIMER0_COUNT	 0xDC11	 /* 10000h-((11059200Hz/(12*FREQ))-17) */
; 
; static xdata unsigned timer0_tick;
; 
; /* 定时器T0中断服务函数 */
CSEG	AT	0000BH
	LJMP	timer0_isr

; static void timer0_isr (void) interrupt 1 using 1  {

	RSEG  ?PR?timer0_isr?TIMER
	USING	1
timer0_isr:
	PUSH 	ACC
	PUSH 	DPH
	PUSH 	DPL
	PUSH 	PSW
			; SOURCE LINE # 8
; 		P1 |= 0x80;
			; SOURCE LINE # 9
	ORL  	P1,#080H
; 		TR0 = 0;				    /* 停止 T0 */
			; SOURCE LINE # 10
	CLR  	TR0
; 		TL0 = TL0 + (TIMER0_COUNT & 0x00FF);
			; SOURCE LINE # 11
	MOV  	A,#011H
	ADD  	A,TL0
	MOV  	TL0,A
; 		TH0 = TH0 + (TIMER0_COUNT >> 8);
			; SOURCE LINE # 12
	MOV  	A,#0DCH
	ADD  	A,TH0
	MOV  	TH0,A
; 		TR0 = 1;		     		/* 启动T0 */		
			; SOURCE LINE # 13
	SETB 	TR0
; 		timer0_tick++;		
			; SOURCE LINE # 14
	MOV  	DPTR,#timer0_tick+01H
	MOVX 	A,@DPTR
	INC  	A
	MOVX 	@DPTR,A
	JNZ  	?C0008
	MOV  	DPTR,#timer0_tick
	MOVX 	A,@DPTR
	INC  	A
	MOVX 	@DPTR,A
?C0008:
; 		P1 &= ~0x80;
			; SOURCE LINE # 15
	ANL  	P1,#07FH
; 	}
			; SOURCE LINE # 16
	POP  	PSW
	POP  	DPL
	POP  	DPH
	POP  	ACC
	RETI 	
; END OF timer0_isr

; 
; /* 定时器T0初始化函数 */
; void timer0_initialize (void) {

	RSEG  ?PR?timer0_initialize?TIMER
timer0_initialize:
			; SOURCE LINE # 19
; 	INT_DISABLE;			/* 关中断 */	
			; SOURCE LINE # 20
	CLR  	EA
; 	timer0_tick = 0;
			; SOURCE LINE # 21
	CLR  	A
	MOV  	DPTR,#timer0_tick
	MOVX 	@DPTR,A
	INC  	DPTR
	MOVX 	@DPTR,A
; 	TR0 = 0;			    /* 停止T0 */	
			; SOURCE LINE # 22
	CLR  	TR0
; 	TMOD &= ~0x0F;		/* 设置T0工作方式 */
			; SOURCE LINE # 23
	ANL  	TMOD,#0F0H
; 	TMOD |= 0x01;			
			; SOURCE LINE # 24
	ORL  	TMOD,#01H
; 	TL0 = (TIMER0_COUNT & 0x00FF);
			; SOURCE LINE # 25
	MOV  	TL0,#011H
; 	TH0 = (TIMER0_COUNT >> 8);	
			; SOURCE LINE # 26
	MOV  	TH0,#0DCH
; 	PT0 = 0;				/* 设置T0中断优先级 */
			; SOURCE LINE # 27
	CLR  	PT0
; 	ET0 = 1;				/* 允许T0中断 */	
			; SOURCE LINE # 28
	SETB 	ET0
; 	TR0 = 1;				/* 启动T0 */	
			; SOURCE LINE # 29
	SETB 	TR0
; 	INT_ENABLE;			/* 开中断 */
			; SOURCE LINE # 30
	SETB 	EA
; }
			; SOURCE LINE # 31
	RET  	
; END OF timer0_initialize

; 
; /* 定时器T0节拍函数 */
; unsigned timer0_count (void) {

	RSEG  ?PR?timer0_count?TIMER
timer0_count:
	USING	0
			; SOURCE LINE # 34
; 	xdata unsigned t;
; 	INT_DISABLE;
			; SOURCE LINE # 36
	CLR  	EA
; 	t = timer0_tick;
			; SOURCE LINE # 37
	MOV  	DPTR,#timer0_tick
	MOVX 	A,@DPTR
	MOV  	R6,A
	INC  	DPTR
	MOVX 	A,@DPTR
	MOV  	R7,A
	MOV  	DPTR,#t?240
	MOV  	A,R6
	MOVX 	@DPTR,A
	INC  	DPTR
	MOV  	A,R7
	MOVX 	@DPTR,A
; 	INT_ENABLE;	
			; SOURCE LINE # 38
	SETB 	EA
; 	return (t);
			; SOURCE LINE # 39
; }
			; SOURCE LINE # 40
?C0003:
	RET  	
; END OF timer0_count

; 
; /* 定时器T0节拍计数函数 */
; unsigned timer0_elapsed_count (unsigned count) {

	RSEG  ?PR?_timer0_elapsed_count?TIMER
_timer0_elapsed_count:
	USING	0
			; SOURCE LINE # 43
;---- Variable 'count?341' assigned to Register 'R4/R5' ----
	MOV  	R5,AR7
	MOV  	R4,AR6
; 	return (timer0_count () - count);
			; SOURCE LINE # 44
	LCALL	timer0_count
	CLR  	C
	MOV  	A,R7
	SUBB 	A,R5
	MOV  	R7,A
	MOV  	A,R6
	SUBB 	A,R4
	MOV  	R6,A
; }
			; SOURCE LINE # 45
?C0004:
	RET  	
; END OF _timer0_elapsed_count

; 
; /*  定时器T0延时函数  */
; void timer0_wait (unsigned count) {

	RSEG  ?PR?_timer0_wait?TIMER
_timer0_wait:
	USING	0
			; SOURCE LINE # 48
;---- Variable 'count?442' assigned to Register 'R2/R3' ----
	MOV  	R3,AR7
	MOV  	R2,AR6
; 	xdata unsigned start_count;
; 	start_count = timer0_count ();	
			; SOURCE LINE # 50
	LCALL	timer0_count
	MOV  	DPTR,#start_count?443
	MOV  	A,R6
	MOVX 	@DPTR,A
	INC  	DPTR
	MOV  	A,R7
	MOVX 	@DPTR,A
?C0005:
; 	while (timer0_elapsed_count (start_count) <= count)
			; SOURCE LINE # 51
	MOV  	DPTR,#start_count?443
	MOVX 	A,@DPTR
	MOV  	R6,A
	INC  	DPTR
	MOVX 	A,@DPTR
	MOV  	R7,A
	LCALL	_timer0_elapsed_count
	SETB 	C
	MOV  	A,R7
	SUBB 	A,R3
	MOV  	A,R6
	SUBB 	A,R2
	JC   	?C0005
; 	  {
			; SOURCE LINE # 52
; 	  }
			; SOURCE LINE # 53
; }
			; SOURCE LINE # 54
?C0007:
	RET  	
; END OF _timer0_wait

	END