Datasheet
© 2007 Microchip Technology Inc. Preliminary DS39625C-page 277
PIC18F2585/2680/4585/4680
REGISTER 23-2: CANSTAT: CAN STATUS REGISTER
Mode 0
R-1 R-0 R-0 R-0 R-0 R-0 R-0 U-0
OPMODE2
(1)
OPMODE1
(1)
OPMODE0
(1)
— ICODE3 ICODE2 ICODE1 —
Mode 1, 2
R-1 R-0 R-0 R-0 R-0 R-0 R-0 R-0
OPMODE2
(1)
OPMODE1
(1)
OPMODE0
(1)
EICODE4 EICODE3 EICODE2 EICODE1 EICODE0
bit 7 bit 0
bit 7-5 OPMODE2:OPMODE0: Operation Mode Status bits
(1)
111 = Reserved
110 = Reserved
101 = Reserved
100 = Configuration mode
011 = Listen Only mode
010 = Loopback mode
001 = Disable/Sleep mode
000 = Normal mode
bit 4 Mode 0:
Unimplemented: Read as ‘0’
bit 3-1 ICODE3:ICODE1: Interrupt Code bits
When an interrupt occurs, a prioritized coded interrupt value will be present in these bits. This
code indicates the source of the interrupt. By copying ICODE3:ICODE1 to WIN2:WIN0 (Mode 0)
or EICODE4:EICODE0 to EWIN4:EWIN0 (Mode 1 and 2), it is possible to select the correct
buffer to map into the Access Bank area. See Example 23-2 for a code example. To simplify the
description, the following table lists all five bits.
bit 0 Unimplemented: Read as ‘0’
bit 4-0 Mode 1, 2:
EICODE4:EICODE0: Interrupt Code bits
See ICODE3:ICODE1 above.
Note 1: To achieve maximum power saving and/or able to wake-up on CAN bus activity,
switch CAN module in Disable mode before putting device to Sleep.
2: If buffer is configured as receiver, EICODE bits will contain ‘10000’ upon interrupt.
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
Mode 0 Mode 1 Mode 2
No interrupt 00000 00000 00000
Error interrupt 00010 00010 00010
TXB2 interrupt 00100 00100 00100
TXB1 interrupt 00110 00110 00110
TXB0 interrupt 01000 01000 01000
RXB1 interrupt 01010 10001 -----
RXB0 interrupt 01100 10000 10000
Wake-up interrupt 00010 01110 01110
RXB0 interrupt ----- 10000 10000
RXB1 interrupt ----- 10001 10000
RX/TX B0 interrupt ----- 10010 10010
RX/TX B1 interrupt ----- 10011 10011
(2)
RX/TX B2 interrupt ----- 10100 10100
(2)
RX/TX B3 interrupt ----- 10101 10101
(2)
RX/TX B4 interrupt ----- 10110 10110
(2)
RX/TX B5 interrupt ----- 10111 10111
(2)