Datasheet

© 2007 Microchip Technology Inc. DS21801E-page 19
MCP2515
REGISTER 3-2: TXRTSCTRL – TXnRTS PIN CONTROL AND STATUS REGISTER
(ADDRESS: 0Dh)
U-0 U-0 R-x R-x R-x R/W-0 R/W-0 R/W-0
— — B2RTS B1RTS B0RTS B2RTSM B1RTSM B0RTSM
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 Unimplemented: Read as ‘0’
bit 6 Unimplemented: Read as ‘0’
bit 5 B2RTS: TX2RTS
Pin State bit
- Reads state of TX2RTS
pin when in Digital Input mode
- Reads as ‘0’ when pin is in ‘Request-to-Send’ mode
bit 4 B1RTS: TX1RTX Pin State bit
- Reads state of TX1RTS pin when in Digital Input mode
- Reads as ‘0’ when pin is in ‘Request-to-Send’ mode
bit 3 B0RTS: TX0RTS Pin State bit
- Reads state of TX0RTS
pin when in Digital Input mode
- Reads as ‘0’ when pin is in ‘Request-to-Send’ mode
bit 2 B2RTSM: TX2RTS
Pin mode bit
1 = Pin is used to request message transmission of TXB2 buffer (on falling edge)
0 = Digital input
bit 1 B1RTSM: TX1RTS
Pin mode bit
1 = Pin is used to request message transmission of TXB1 buffer (on falling edge)
0 = Digital input
bit 0 B0RTSM: TX0RTS Pin mode bit
1 = Pin is used to request message transmission of TXB0 buffer (on falling edge)
0 = Digital input
REGISTER 3-3: TXBnSIDH – TRANSMIT BUFFER n STANDARD IDENTIFIER HIGH
(ADDRESS: 31h, 41h, 51h)
R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x
SID10 SID9 SID8 SID7 SID6 SID5 SID4 SID3
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 SID: Standard Identifier bits <10:3>