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18F8680 Datasheet(PDF) 295 Page - Microchip Technology |
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18F8680 Datasheet(HTML) 295 Page - Microchip Technology |
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295 / 496 page  2004 Microchip Technology Inc. DS30491C-page 293 PIC18F6585/8585/6680/8680 REGISTER 23-14: RXB1CON: RECEIVE BUFFER 1 CONTROL REGISTER Mode 0 R/C-0 R/W-0 R/W-0 U-0 R-0 R/W-0 R-0 R-0 RXFUL RXM1 RXM0 — RXRTRRO FILHIT2 FILHIT1 FILHIT0 Mode 1, 2 R/C-0 R/W-0 R-0 R-0 R-0 R-0 R-0 R-0 RXFUL RXM1 RTRRO FILHIT4 FILHIT3 FILHIT2 FILHIT1 FILHIT0 bit 7 bit 0 bit 7 RXFUL: Receive Full Status bit 1 = Receive buffer contains a received message 0 = Receive buffer is open to receive a new message Note: This bit is set by the CAN module upon receiving a message and must be cleared by software after the buffer is read. As long as RXFUL is set, no new message will be loaded and buffer will be considered full. bit 6 Mode 0: RXM1: Receive Buffer Mode bit 1; combines with RXM0 to form RXM<1:0> bits (see bit 5) 11 = Receive all messages (including those with errors); filter criteria is ignored 10 = Receive only valid messages with extended identifier; EXIDEN in RXFnSIDL must be ‘1’ 01 = Receive only valid messages with standard identifier, EXIDEN in RXFnSIDL must be ‘0’ 00 = Receive all valid messages as per EXIDEN bit in RXFnSIDL register Mode 1, 2: RXM1: Receive Buffer Mode bit 1 = Receive all messages (including those with errors); acceptance filters are ignored 0 = Receive all valid messages as per acceptance filters bit 5 Mode 0: RXM0: Receive Buffer Mode bit 0; combines with RXM1 to form RXM<1:0> bits (see bit 6) Mode 1, 2: RTRRO: Remote Transmission Request bit for Received Message (read-only) 1 = A remote transmission request is received 0 = A remote transmission request is not received bit 4 Mode 0: Unimplemented: Read as ‘0’ Mode 1, 2: FILHIT4: Filter Hit bit 4 This bit combines with other bits to form filter acceptance bits <4:0>. bit 3 Mode 0: RXRTRRO: Remote Transmission Request bit for Received Message (read-only) 1 = A remote transmission request is received 0 = A remote transmission request is not received Mode 1, 2: FILHIT3: Filter Hit bit 3 This bit combines with other bits to form filter acceptance bits <4:0>. bit 2-0 Mode 0: FILHIT2:FILHIT0: Filter Hit bits These bits indicate which acceptance filter enabled the last message reception into Receive Buffer 1. 111 = Reserved 110 = Reserved 101 = Acceptance Filter 5 (RXF5) 100 = Acceptance Filter 4 (RXF4) 011 = Acceptance Filter 3 (RXF3) 010 = Acceptance Filter 2 (RXF2) 001 = Acceptance Filter 1 (RXF1), only possible when RXB0DBEN bit is set 000 = Acceptance Filter 0 (RXF0), only possible when RXB0DBEN bit is set Mode 1, 2: FILHIT2:FILHIT0 Filter Hit bits <2:0> These bits, in combination with FILHIT<4:3>, indicate which acceptance filter enabled the message reception into this receive buffer. 01111 = Acceptance Filter 15 (RXF15) 01110 = Acceptance Filter 14 (RXF14) ... 00000 = Acceptance Filter 0 (RXF0) Legend: U = Unimplemented bit, read as ‘0’ - n = Value at POR C = Clearable bit R = Readable bit W = Writable bit x = Bit is unknown ‘1’ = Bit is set ‘0’ = Bit is cleared |
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