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MCP2515
REGISTER 3-2:
TXRTSCTRL – TXnRTS PIN CONTROL AND STATUS REGISTER
(ADDRESS: 0Dh)
U-0
—
U-0
—
R-x
B2RTS
R-x
B1RTS
R-x
B0RTS
R/W-0
B2RTSM
R/W-0
B1RTSM
R/W-0
B0RTSM
bit 7
Legend:
bit 0
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 7-6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Unimplemented: Read as ‘ 0 ’
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
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
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
B2RTSM: TX2RTS Pin mode bit
1 = Pin is used to request message transmission of TXB2 buffer (on falling edge)
0 = Digital input
B1RTSM: TX1RTS Pin mode bit
1 = Pin is used to request message transmission of TXB1 buffer (on falling edge)
0 = Digital input
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
SID10
R/W-x
SID9
R/W-x
SID8
R/W-x
SID7
R/W-x
SID6
R/W-x
SID5
R/W-x
SID4
R/W-x
SID3
bit 7
Legend:
bit 0
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<10:3>: Standard Identifier bits
? 2003-2012 Microchip Technology Inc.
DS21801G-page 19
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