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Re: PIC 16F877 pwm控制LED問題
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新會員
 
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謝謝版主的告知....我用示波器去量測有看到PWM的波形了。
發表於: 2006/11/13 17:33
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Re: PIC 16F877 pwm控制LED問題
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版主
 
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控制duty cycle只會讓LED的亮度改變，這跟LED的閃爍效果無關。
發表於: 2006/11/13 10:41
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PIC 16F877 pwm控制LED問題
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新會員
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我用PIC 16F877寫一個PWM的程式，由AD來改變PWM的Duty使LED會閃爍。而我在轉動AD時，LED會由亮到不亮，但是在亮時LED為啥不會閃爍呢？我程式有那邊寫錯呢？麻煩各位大大幫我改一下，謝謝
LIST P=16F877 INCLUDE P16F877.INC ORG 0x00 NOP START BANKSEL ADCON1 MOVLW B'00001110' MOVWF ADCON1 BANKSEL ADCON0 MOVLW B'10000001' MOVWF ADCON0 BANKSEL TRISC MOVLW B'00000000' MOVWF TRISC BANKSEL PORTC MOVLW B'00000000' MOVWF PORTC MOVLW 0XFF MOVWF PR2 BANKSEL TMR2 CLRF TMR2 MOVLW 0X80 MOVWF CCPR1L MOVLW 0X0C MOVWF CCP1CON MOVLW 0X00 MOVWF T2CON BSF T2CON,TMR2ON MAIN1: BSF ADCON0,GO MAIN2: BTFSC ADCON0,GO GOTO MAIN2 MOVF ADRESH,W MOVWF CCPR1L GOTO MAIN1 END
發表於: 2006/11/12 23:15
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