
PIC18F6585/8585/6680/8680
DS30491C-page 318
2004 Microchip Technology Inc.
23.2.5
CAN MODULE I/O CONTROL
REGISTER
This register controls the operation of the CAN module’s
I/O pins in relation to the rest of the microcontroller.
REGISTER 23-55: CIOCON: CAN I/O CONTROL REGISTER
R/W-0
U-0
TX2SRC
TX2EN
ENDRHI
CANCAP
—
bit 7
bit 0
bit 7
TX2SRC: CANTX2 Pin Data Source bit
1
= CANTX2 pin will output the CAN clock
0
= CANTX2 pin will output CANTX1
bit 6
TX2EN: CANTX2 Pin Enable bit
1
= CANTX2 pin will output CANTX1 or CAN clock as selected by TX2SRC bit
0
= CANTX2 pin will have digital I/O function
bit 5
ENDRHI: Enable Drive High bit(1)
1
= CANTX pin will drive VDD when recessive
0
= CANTX pin will be tri-state when recessive
bit 4
CANCAP: CAN Message Receive Capture Enable bit
1
= Enable CAN capture, CAN message receive signal replaces input on RC2/CCP1
0
= Disable CAN capture, RC2/CCP1 input to CCP1 module
bit 3-0
Unimplemented: Read as ‘0’
Note 1: Always set this bit when using differential bus to avoid signal crosstalk in CANTX
from other nearby pins.
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