pwm42w16.asm

ADUC842 C程序集,包括ADC,DAC,PLL,PWM,WDT等程序．

;File: pwm42w16.asm
 ; Author: Eckart Hartmann Date:17/10/2003
 ; Development progress: Pwm834.df
;
;PwmW16==========Write 16 bit:
;C Function prototype: char PwmW16(char cCh, int iVal).
;Description of Function: Write 16 bit channel value.
;User interface: Set parameter1 to 0 to write PWM0H/L or non zero to 
;		write PWM1H/L. Put the value to write in parameter2.
 ; See Description for more details.
;		Call PwmW16. If in 16 bit mode or mode 0, writes value and
;		returns 1 else just returns 0. 
;Robustness: If selected mode is not 16 bit, wrong timing results on both 
;		channels. Changes only become effective at the end of the 
;		current PWM cycle.
;Side effects: Overwrites a, P, c.
;
NAME PWMW16
$NOMOD51
 $IC(..kei842.inc) ; Parameter passing registers for Keil .
 $IC(..kei842.dat) ; SFR definition for Keil .
;
public _PwmW16

?PR?_PwmW16?PWMW16	SEGMENT CODE
	RSEG	?PR?_PwmW16?PWMW16
;
_PwmW16:
	mov	a,PWMCON	;if(16 bit mode)
	anl	a,#070h
	jz	Pw6Do
	cjne	a,#10h,Pw6Q3
	sjmp	Pw6Do
Pw6Q3:	cjne	a,#30h,Pw6Q4
	sjmp	Pw6Do
Pw6Q4:	cjne	a,#40h,Pw6Q6
	sjmp	Pw6Do
Pw6Q6:	cjne	a,#60h,Pw6R0	; {
Pw6Do:	mov	a,cP1l		; if(cCh==0)
	jnz	Pw6C
	mov	PWM0L,iP2lc	;  PWM0L/H = iP2l/h;
	mov	PWM0H,iP2hc
	sjmp	Pw6R1
Pw6C:	mov	PWM1L,iP2lc	; else PWM1L/H = iP2l/h;
	mov	PWM1H,iP2hc
Pw6R1:	mov	cP1l,#1		; return 1;
	sjmp	Pw6R		; }
Pw6R0:	mov	cP1l,#0		;else return 0;
Pw6R:	ret
;
;Function End==========================================================Function End
END
;