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PIC18F4685-I/SP Datasheet(PDF) 296 Page - Microchip Technology |
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PIC18F4685-I/SP Datasheet(HTML) 296 Page - Microchip Technology |
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296 / 484 page  PIC18F2682/2685/4682/4685 DS39761B-page 294 Preliminary © 2007 Microchip Technology Inc. EXAMPLE 23-5: READING A CAN MESSAGE REGISTER 23-21: RXERRCNT: RECEIVE ERROR COUNT REGISTER R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 REC7 REC6 REC5 REC4 REC3 REC2 REC1 REC0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-0 REC7:REC0: Receive Error Counter bits This register contains the receive error value as defined by the CAN specifications. When RXERRCNT > 127, the module will go into an error-passive state. RXERRCNT does not have the ability to put the module in “bus-off” state. ; Need to read a pending message from RXB0 buffer. ; To receive any message, filter, mask and RXM1:RXM0 bits in RXB0CON registers must be ; programmed correctly. ; ; Make sure that there is a message pending in RXB0. BTFSS RXB0CON, RXFUL ; Does RXB0 contain a message? BRA NoMessage ; No. Handle this situation... ; We have verified that a message is pending in RXB0 buffer. ; If this buffer can receive both Standard or Extended Identifier messages, ; identify type of message received. BTFSS RXB0SIDL, EXID ; Is this Extended Identifier? BRA StandardMessage ; No. This is Standard Identifier message. ; Yes. This is Extended Identifier message. ; Read all 29-bits of Extended Identifier message. ... ; Now read all data bytes MOVFF RXB0DO, MY_DATA_BYTE1 ... ; Once entire message is read, mark the RXB0 that it is read and no longer FULL. BCF RXB0CON, RXFUL ; This will allow CAN Module to load new messages ; into this buffer. ... |
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