Datasheet

PIC18F2480/2580/4480/4580
DS39637A-page 276 Preliminary  2004 Microchip Technology Inc.
REGISTER 23-1: CANCON: CAN CONTROL REGISTER
Mode 0
R/W-1 R/W-0 R/W-0 R/S-0 R/W-0 R/W-0 R/W-0 U-0
REQOP2 REQOP1 REQOP0 ABAT WIN2 WIN1 WIN0
—
Mode 1
R/W-1 R/W-0 R/W-0 R/S-0 U-0 U-0 U-0 U-0
REQOP2 REQOP1 REQOP0 ABAT
— — — —
Mode 2
R/W-1 R/W-0 R/W-0 R/S-0 R-0 R-0 R-0 R-0
REQOP2 REQOP1 REQOP0 ABAT FP3 FP2 FP1 FP0
bit 7 bit 0
bit 7-5 REQOP2:REQOP0: Request CAN Operation Mode bits
1xx = Request Configuration mode
011 = Request Listen Only mode
010 = Request Loopback mode
001 = Request Disable mode
000 = Request Normal mode
bit 4 ABAT: Abort All Pending Transmissions bit
1 = Abort all pending transmissions (in all transmit buffers)
0 = Transmissions proceeding as normal
bit 3-1 Mode 0:
WIN2:WIN0: Window Address bits
This selects which of the CAN buffers to switch into the access bank area. This allows access
to the buffer registers from any data memory bank. After a frame has caused an interrupt, the
ICODE3:ICODE0 bits can be copied to the WIN3:WIN0 bits to select the correct buffer. See
Example 23-2 for a code example.
111 = Receive Buffer 0
110 = Receive Buffer 0
101 = Receive Buffer 1
100 = Transmit Buffer 0
011 = Transmit Buffer 1
010 = Transmit Buffer 2
001 = Receive Buffer 0
000 = Receive Buffer 0
bit 0 Unimplemented: Read as ‘0’
bit 4-0 Mode 1:
Unimplemented: Read as ‘0’
Mode 2:
FP3:FP0: FIFO Read Pointer bits
These bits point to the message buffer to be read.
0111:0000 = Message buffer to be read
1111:1000 = Reserved
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