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18F8680 Datasheet(PDF) 299 Page - Microchip Technology |
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18F8680 Datasheet(HTML) 299 Page - Microchip Technology |
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299 / 496 page ![]() 2004 Microchip Technology Inc. DS30491C-page 297 PIC18F6585/8585/6680/8680 23.2.3.1 Programmable TX/RX and Auto RTR Buffers The ECAN module contains 6 message buffers that can be programmed as transmit or receive buffers. Any of these buffers can also be programmed to automatically handle RTR messages. REGISTER 23-22: BnCON: TX/RX BUFFER n CONTROL REGISTERS IN RECEIVE MODE [0 ≤ n ≤ 5, TXnEN (BSEL0<n>) = 0](1) Note: These registers are not used in Mode 0. 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) 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 RXM1: Receive Buffer Mode bit 1 = Receive all messages including partial and invalid (acceptance filters are ignored) 0 = Receive all valid messages as per acceptance filters bit 5 RTRRO: Read-Only Remote Transmission Request bit for Received Message 1 = Received message is a remote transmission request 0 = Received message is not a remote transmission request bit 4-0 FILHIT4:FILHIT0: Filter Hit bits These bits indicate which acceptance filter enabled the last message reception into this buffer. 01111 = Acceptance Filter 15 (RXF15) 01110 = Acceptance Filter 14 (RXF14) ... 00001 = Acceptance Filter 1 (RXF1) 00000 = Acceptance Filter 0 (RXF0) Note 1: These registers are available in Mode 1 and 2 only. 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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