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Re: PWM
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版主
 
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基本上將AD最高的8位元取出後直接傳給PR2來設定Period，然後將AD值又轉一位後傳給 CCPR1L 設定Duty
發表於: 2006/10/25 10:46
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Re: PWM
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新會員
 
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那如果我這樣寫可以嗎？
LIST P=16F873A #INCLUDE <P16F873A.INC> CBLOCK 0X20 ENDC CBLOCK Count ENDC ORG 0 NOP GOTO MAIN MAIN: BANKSEL ADCON1 MOVLW B'00001110' MOVWF ADCON1 BANKSEL ADCON0 MOVLW B'10000001' MOVWF ADCON0 BANKSEL PR2 MOVLW ADRESH MOVWF PR2 BCF TRISC,2 BANKSEL CCP1CON MOVLW B'00001111' MOVWF CCP1CON MOVLW B'00000101' MOVWF T2CON CALL DELAY20 DELAY20: movlw 0x64 movwf Count D20Loop: decfsz Count,F goto D20Loop return MAIN1: BSF ADCON0,GO MAIN2: BTFSC ADCON0,GO GOTO MAIN2 MOVF ADRESH,W MOVWF CCPR1L GOTO MAIN1 END
發表於: 2006/10/23 14:29
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Re: PWM
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高級會員
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把AD值 經過查表或是轉換 在放在一各暫存器
而這各暫存器就是PWM的DUTY CYCLE 的寬度 或 而這各暫存器就是PWM的PERIOD 的寬度
發表於: 2006/10/22 16:56
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PWM
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新會員
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請問一下我要如何寫一個程式能讓pwm的頻率因為AD值的輸入不同來改變呢？
發表於: 2006/10/22 15:04
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