TM4C123FE6PM Datasheet, PDF (1029/1370 Pages) Texas Instruments – Tiva™ TM4C123FE6PM Microcontroller

Tiva^™ TM4C123FE6PM Microcontroller
Register 1: CAN Control (CANCTL), offset 0x000
This control register initializes the module and enables test mode and interrupts.
The bus-off recovery sequence (see CAN Specification Rev. 2.0) cannot be shortened by setting
or clearing INIT. If the device goes bus-off, it sets INIT, stopping all bus activities. Once INIT
has been cleared by the CPU, the device then waits for 129 occurrences of Bus Idle (129 * 11
consecutive High bits) before resuming normal operations. At the end of the bus-off recovery
sequence, the Error Management Counters are reset.
During the waiting time after INIT is cleared, each time a sequence of 11 High bits has been
monitored, a BITERROR0 code is written to the CANSTS register (the LEC field = 0x5), enabling
the CPU to readily check whether the CAN bus is stuck Low or continuously disturbed, and to monitor
the proceeding of the bus-off recovery sequence.
CAN Control (CANCTL)
CAN0 base: 0x4004.0000
CAN1 base: 0x4004.1000
Offset 0x000
Type RW, reset 0x0000.0001
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
TEST CCE
DAR reserved EIE
SIE
IE
INIT
Type RO
RO
RO
RO
RO
RO
RO
RO
RW
RW
RW
RO
RW
RW
RW
RW
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Bit/Field
31:8
7
Name
reserved
TEST
Type
RO
RW
Reset Description
0x0000.00 Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0
Test Mode Enable
Value
0
1
Description
The CAN controller is operating normally.
The CAN controller is in test mode.
6
CCE
RW
0
Configuration Change Enable
Value
0
1
Description
Write accesses to the CANBIT register are not allowed.
Write accesses to the CANBIT register are allowed if the
INIT bit is 1.
5
DAR
RW
0
Disable Automatic-Retransmission
Value
0
1
Description
Auto-retransmission of disturbed messages is enabled.
Auto-retransmission is disabled.
June 12, 2014
Texas Instruments-Production Data
1029