Datasheet

PIC18F2682/2685/4682/4685
DS39761C-page 282 © 2009 Microchip Technology Inc.
REGISTER 23-3: ECANCON: ENHANCED CAN CONTROL REGISTER
R/W-0 R/W-0 R/W-0 R/W-1 R/W-0 R/W-0 R/W-0 R/W-0
MDSEL1
(1)
MDSEL0
(1)
FIFOWM
(2)
EWIN4 EWIN3 EWIN2 EWIN1 EWIN0
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 7-6 MDSEL1:MDSEL0: Mode Select bits
(1)
00 = Legacy mode (Mode 0, default)
01 = Enhanced Legacy mode (Mode 1)
10 = Enhanced FIFO mode (Mode 2)
11 = Reserved
bit 5 FIFOWM: FIFO High Water Mark bit
(2)
1 = Will cause FIFO interrupt when one receive buffer remains
(3)
0 = Will cause FIFO interrupt when four receive buffers remain
bit 4-0 EWIN4:EWIN0: Enhanced Window Address bits
These bits map the group of 16 banked CAN SFRs into access bank addresses 0F60-0F6Dh. Exact
group of registers to map is determined by binary value of these bits.
Mode 0:
Unimplemented: Read as ‘0’
Mode 1, 2:
00000 = Acceptance Filters 0, 1, 2 and BRGCON2, 3
00001 = Acceptance Filters 3, 4, 5 and BRGCON1, CIOCON
00010 = Acceptance Filter Masks, Error and Interrupt Control
00011 = Transmit Buffer 0
00100 = Transmit Buffer 1
00101 = Transmit Buffer 2
00110 = Acceptance Filters 6, 7, 8
00111 = Acceptance Filters 9, 10, 11
01000 = Acceptance Filters 12, 13, 14
01001 = Acceptance Filters 15
01010-01110 = Reserved
01111 = RXINT0, RXINT1
10000 = Receive Buffer 0
10001 = Receive Buffer 1
10010 = TX/RX Buffer 0
10011 = TX/RX Buffer 1
10100 = TX/RX Buffer 2
10101 = TX/RX Buffer 3
10110 = TX/RX Buffer 4
10111 = TX/RX Buffer 5
11000-11111 = Reserved
Note 1: These bits can only be changed in Configuration mode. See Register 23-1 to change to Configuration mode.
2: This bit is used in Mode 2 only.
3: FIFO length of 4 or less will cause this bit to be set.