pll41dly.asm

ADuC841的详细程序

;File: pll41dly.a51
;Author: Eckart Hartmann Date:15/10/2003
;Development progress: Pll814.df
;
;PllDly==========Software delay
;C Function prototype: char PllDly(uint uDlyMs);
;Description of Function: Causes software delay of uDlyMs milliseconds.
;User interface: Put delay in parameter1. Call PllDly.
;		Returns with 1 (always).
;Robustness:	This function assumes a crystal of 11.058MHz.
;		Delay will be increased if normal interrupts occur during delay.
;Side effects: Overwrites a, p and iP2l.
;
NAME	PLLDLY
$NOMOD51
 $IC(..kei841.inc) ; Parameter passing registers for Keil .
 $IC(..kei841.dat) ; SFR definition for Keil .
;
public _PllDly

?PR?_PllDly?PLLDLY	SEGMENT CODE
	RSEG	?PR?_PllDly?PLLDLY
	
_PllDly:
	mov	a,iP1l		;for(; rR7; rR7--)
	jnz	PlDCd		;  {
PlDCh6:	mov	a,iP1h		;  for(; rR6; rR6--)
	jz	PlDR		;    { //High byte with low byte full scale.
	dec	iP1h
PlDCd:	mov	iP2li,#11	;    for(c5=11 ; c5; c5--)
LpC5:	mov	a,#250		;      {
	djnz	ACC,$		;      4*250 cycles.      
	djnz	iP2li,LpC5	;      }
	djnz	iP1l,PlDCd	;    }
	sjmp	PlDCh6		;  }
PlDR:	mov	cP1l,#1		;return(1);	// Always.
	ret
;
;Function End==========================================================Function End
end