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1 Anonymous Users
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Re: PIC16F877的portA不能當按鍵輸入??
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高級會員
 
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PortA 的 A/D 功能要關掉.才能正常動作.
預設A/D 是打開的. 還有RA4 是O.D. 架構..要Pull-High才可以用. ADCON1 暫存器企看看吧...全部都設為I/O的話 就設為 0x06 ....
發表於: 2005/6/7 11:47
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PIC16F877的portA不能當按鍵輸入??
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新會員
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請教諸位高手解惑.......
在下使用PIC16F877 作步進馬達正逆快慢轉按鍵輸入,portD輸出 portA不能當按鍵輸入,因為portD無輸出 但是portC能當按鍵輸入,portD有輸出 何故??? 請教諸位高手解惑.......謝謝!! 
發表於: 2005/6/7 11:18
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