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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PIC18F258-E/LSQTP 데이터시트(PDF) 206 Page - Microchip Technology |
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PIC18F258-E/LSQTP 데이터시트(HTML) 206 Page - Microchip Technology |
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206 / 402 page  PIC18FXX8 DS41159E-page 204 © 2006 Microchip Technology Inc. EXAMPLE 19-1: WIN AND ICODE BITS USAGE IN INTERRUPT SERVICE ROUTINE TO ACCESS TX/RX BUFFERS (CONTINUED) RXB0Interrupt BCF PIR3, RXB0IF ; Clear the interrupt flag GOTO AccessBuffer AccessBuffer ; This is either TX or RX interrupt ; Copy CANCON.ICODE bits to CANSTAT.WIN bits MOVF CANCON, W ; Clear CANCON.WIN bits before copying ; new ones. ANDLW b’11110001’ ; Use previously saved CANCON value to ; make sure same value. MOVWF CANCON ; Copy masked value back to TempCANCON MOVF TempCANSTAT, W ; Retrieve ICODE bits ANDLW b’00001110’ ; Use previously saved CANSTAT value ; to make sure same value. IORWF CANCON ; Copy ICODE bits to WIN bits. ; Copy the result to actual CANCON ; Access current buffer… ; User code ; Restore CANCON.WIN bits MOVF CANCON, W ; Preserve current non WIN bits ANDLW b’11110001’ IORWF TempCANCON, W ; Restore original WIN bits MOVWF CANCON ; Do not need to restore CANSTAT - it is read-only register. ; Return from interrupt or check for another module interrupt source |
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