delay.src

hd7279接口芯片适用于扩展键盘和led

; .\delay.SRC generated from: delay.c
; COMPILER INVOKED BY:
;        D:\Program Files\keil\C51\BIN\C51.EXE delay.c ROM(SMALL) BROWSE DEBUG OBJECTEXTEND SRC(.\delay.SRC)


NAME	DELAY

?PR?long_delay?DELAY SEGMENT CODE INBLOCK 
?PR?short_delay?DELAY                    SEGMENT CODE INBLOCK 
?PR?_delay1ms?DELAY  SEGMENT CODE INBLOCK 
	PUBLIC	_delay1ms
	PUBLIC	short_delay
	PUBLIC	long_delay
; #include<intrins.h>
; void long_delay(void)

	RSEG  ?PR?long_delay?DELAY
long_delay:
			; SOURCE LINE # 2
; {
			; SOURCE LINE # 3
; 	#pragma asm
; 	LONGDELAY:	MOV R5,#125//延时约250us
	  LONGDELAY:	MOV R5,#125 
; 				DJNZ R5,$
	  DJNZ R5,$
; 	#pragma endasm
; }
			; SOURCE LINE # 8
	RET  	
; END OF long_delay

; void short_delay(void)

	RSEG  ?PR?short_delay?DELAY
short_delay:
			; SOURCE LINE # 9
; {
			; SOURCE LINE # 10
; 	#pragma asm
; 	SHORTDELAY:	MOV R6,#50 //延时约100us
	  SHORTDELAY:	MOV R6,#50  
; 				DJNZ R6,$
	  DJNZ R6,$
; 	#pragma endasm
; }
			; SOURCE LINE # 15
	RET  	
; END OF short_delay

; void delay1ms(unsigned int ms)

	RSEG  ?PR?_delay1ms?DELAY
_delay1ms:
	USING	0
			; SOURCE LINE # 16
;---- Variable 'ms?240' assigned to Register 'R6/R7' ----
; {
			; SOURCE LINE # 17
; 	unsigned char i,j;
; 	for(i=0;i<ms;i++)
			; SOURCE LINE # 19
;---- Variable 'i?241' assigned to Register 'R5' ----
	CLR  	A
	MOV  	R5,A
?C0003:
	MOV  	A,R5
	CLR  	C
	SUBB 	A,R7
	CLR  	A
	SUBB 	A,R6
	JNC  	?C0009
; 		for(j=0;j<200;j++) //执行时间约1ms
			; SOURCE LINE # 20
;---- Variable 'j?242' assigned to Register 'R4' ----
	CLR  	A
	MOV  	R4,A
?C0006:
; 		{
			; SOURCE LINE # 21
; 			_nop_();
			; SOURCE LINE # 22
	NOP  	
; 			_nop_();
			; SOURCE LINE # 23
	NOP  	
; 		}
			; SOURCE LINE # 24
	INC  	R4
	CJNE 	R4,#0C8H,?C0006
?C0005:
	INC  	R5
	SJMP 	?C0003
; }			 			; SOURCE LINE # 25
?C0009:
	RET  	
; END OF _delay1ms

	END