main.a51

that is an example for pluse width modulation and that programe is written by c++

;******************************************************
; 2002-08-10 by Johnson Chang, 8051.24cc.com [e-mail]
; Description:
;	PWM controller by 2 push bottom switches
;	SW3 is the increament switch. Pulse width increased when SW3 pressed
;	SW1 is the decreament switch. Pulse width decreased when SW1 pressed
;	T=5mS
;	Pulse Width = 0.1mS - 4.99mS
;******************************************************
;	跑计﹚竡跋
PW	equ	4 ;=R4
T	equ	5 ;=R5
;
SW1	equ	P1.4	;オ 龄
SW2	equ	P1.5	;