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請問有關"組合語言"的問題.....
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高級會員
 
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我是剛接觸PIC組合語言的新手,以前是用C....所以有一些問題想跟各位先進請教一下....
以下是節錄USB相關程式的片段.... InitUSB clrf UIE, ACCESS clrf UIR, ACCESS movlw 0x10 movwf UCFG, ACCESS movlw 0x08 movwf UCON, ACCESS banksel USB_curr_config clrf USB_curr_config, BANKED clrf USB_USWSTAT, BANKED movlw 0x01 movwf USB_device_status, BANKED movlw NO_REQUEST movwf USB_dev_req, BANKED 請問.... 1.在clrf UIE, ACCESS ===> 請問為什麼要有"ACCESS"這個參數阿...?..有什麼特殊意義嗎..? 2. banksel USB_curr_config ===> 這行是指select bank0 為什麼在這行之後的參數由ACCESS變成BANKED....? 注 : USB_curr_config res 1
發表於: 2006/5/18 21:05
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