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Re: 請教f312380及各位先進，我的程式依然存在相同的問題，沒有改變！！
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高級會員
 
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MOVLW 0xF0
MOVWF TRISB PORTB7--4 設定為輸入 要怎麼讓他0阿
發表於: 2006/7/25 12:13
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微電腦自動控制設計，產品製造
才疏學淺，若有錯誤敬請指正 |
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請教f312380及各位先進，我的程式依然存在相同的問題，沒有改變！！
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新會員
 
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我的程式再附上如下，之前f312380先生告知的這個訊息，我之前也試過，但其實最大的問題點在於InitPortB這個subroutine初始化完之後，PORTB的值被強迫為0x30，而不是0x00，所以會有非預期的輸出（實際接板子抓出的問題），所以麻煩各位如果有人有能力解決這個問題的話給點主意吧：
list p = 18F452 #include <p18F452.inc> TEMP EQU 0x02 ORG 0x00 GOTO START ORG 0x08 GOTO ServiceInterrupt org 0x20 START call InitPortB ;initalize port B bsf RCON,IPEN bsf INTCON,GIEH loop sleep ;sleep till key is hit nop goto loop ServiceInterrupt btfsc INTCON,RBIF ;change on rb int? goto ServiceWakup ;yes then service bcf INTCON,TMR0IE ;clear TMR0 int mask bcf INTCON,TMR0IF ;clear flag return ServiceWakup bcf INTCON,RBIE ;clear mask MOVF PORTB,W ;read PORTB bcf INTCON,RBIF ;clear flag call delay16 ;do de-bounce for 16mSecs MOVF PORTB,W ;read port B again andlw B'11110000' ;mask outputs movwf TEMP ;save in temp swapf TEMP,F ;switch low and high movfF TEMP,LATB ;send as outputs. call KeyRelease ;check for key release RETFIE KeyRelease call delay16 ;do debounce MOVF PORTB,W ;read PORTB bcf INTCON,RBIF ;clear flag bsf INTCON,RBIE ;enable mask andlw B'11110000' ;clear outputs btfsc STATUS,Z ;key still pressed? return ;no then return sleep ;else save power bcf INTCON,RBIE ;on wake up clear mask MOVF PORTB,W bcf INTCON,RBIF ;clear flag goto KeyRelease ;try again InitPortB CLRF PORTB CLRF LATB MOVLW 0x0F ; 使PORTB為 MOVWF ADCON1 ; Digital I/O MOVLW 0xF0 MOVWF TRISB bcf INTCON2,RBPU ;enable pull up bcf INTCON,RBIE ;disable mask movf PORTB,W ;read port bcf INTCON,RBIF ;clear flag bsf INTCON,RBIE ;enable mask RETURN delay16 movlw B'11000111' ;fosc/256 --> TMR0 movwf T0CON ; / clrf TMR0L bcf INTCON,TMR0IF ;clear flag bsf INTCON,TMR0IE ;enable mask CheckAgain btfss INTCON,TMR0IF ;timer overflowed? goto CheckAgain ;no check again bcf INTCON,TMR0IE ;else clear mask bcf INTCON,TMR0IF ;clear flag return end
發表於: 2006/7/25 11:46
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