PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 201
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PIC18F258
Manufacturer Part Number
PIC18F258
Description
High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F258.pdf
(384 pages)
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19.2
There are many control and data registers associated
with the CAN module. For convenience, their
descriptions have been grouped into the following
sections:
• Control and Status Registers
• Transmit Buffer Registers (Data and Control)
• Receive Buffer Registers (Data and Control)
• Baud Rate Control Registers
• I/O Control Register
• Interrupt Status and Control Registers
REGISTER 19-1:
2002 Microchip Technology Inc.
Note:
CAN Module Registers
bit 7-5
bit 4
bit 3-1
bit 0
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
ICODE3:ICODE0 bits can be copied to the WIN3:WIN0 bits to select the correct buffer. See
Example 19-1 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
REQOP0
W = Writable bit
’1’ = Bit is set
R/W-0
Preliminary
R/W-0
ABAT
19.2.1
The registers described in this section control the over-
all operation of the CAN module and show its
operational status.
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
R/W-0
WIN2
CAN CONTROL AND STATUS
REGISTERS
R/W-0
WIN1
PIC18FXX8
x = Bit is unknown
R/W-0
WIN0
DS41159B-page 199
U-0
—
bit 0
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