PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 185

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

17.2
There are many registers associated with the CAN
module. Descriptions of these registers are grouped
into sections. These sections are:
• Control and Status Registers
• Transmit Buffer Registers
• Receive Buffer Registers
• Baud Rate Control Registers
• Interrupt Status and Control Registers
REGISTER 17-1:
Note:
2000 Microchip Technology Inc.
bit 7-5
bit 4
bit 3-1
bit 0
Control Registers for the CAN Module
Not all CAN registers are available in the
access bank.
CANCON – CAN CONTROL REGISTER
bit 7
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
ABAT: Abort All Pending Transmissions bit
1 = Abort all pending transmissions (in all transmit buffers)
0 = Transmissions proceeding as normal
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
ICODE2:ICODE0 bits can be copied to the WIN2:WIN0 bits to select the correct buffer. See
Example 17-1 for 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
Unimplemented: Read as ’0’
Legend:
R = Readable bit
- n = Value at POR
REQOP2
R/W-1
REQOP1
R/W-0
Advanced Information
W = Writable bit
’1’ = Bit is set
REQOP0
R/W-0
R/W-0
ABAT
17.2.1
This section shows the CAN Control and Status
registers.
CAN CONTROL AND STATUS REGISTERS
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
R/W-0
WIN2
R/W-0
WIN1
PIC18CXX8
x = Bit is unknown
R/W-0
WIN0
DS30475A-page 185
U-0
—
bit 0