675
CAN Controller (CAN)
Chapter 19
Preliminary User’s Manual U17566EE1V2UM00
19.6 Control Registers
(1)
CnGMCTRL - CANn global control register
The CnGMCTRL register is used to control the operation of the CAN module.
(a) Read
Caution
1.
While the MBON bit is cleared (to 0), software access to the message
buffers (CnMDATA0m, CnMDATA1m, CnMDATA01m, CnMDATA2m,
CnMDATA3m, CnMDATA23m, CnMDATA4m, CnMDATA5m, CnMDATA45m,
CnMDATA6m, CnMDATA7m, CnMDATA67m, CnMDLCm, CnMCONFm,
CnMIDLm, CnMIDHm, and CnMCTRLm), or registers related to transmit
history or receive history (CnLOPT, CnTGPT, CnLIPT, and CnRGPT) is
disabled.
2.
This bit is read-only. Even if 1 is written to the MBON bit while it is 0, the
value of the MBON bit does not change, and access to the message buffer
registers, or registers related to transmit history or receive history remains
disabled.
Note
MBON bit is cleared (to 0) when the CAN module enters CAN sleep mode/
CAN stop mode or GOM bit is cleared (to 0).
MBON bit is set (to 1) when the CAN sleep mode/the CAN stop mode is
released or GOM bit is set (to 1).
After reset: 0000H
R/W
Address: <CnRBaseAddr> + 000
H
15
14
13
12
11
10
9
8
CnGMCTRL
MBON
0
0
0
0
0
0
0
7
6
5
4
3
2
1
0
0
0
0
0
0
0
EFSD
GOM
MBON
Bit enabling access to message buffer register, transmit/receive history registers
0
Write access and read access to the message buffer register and the transmit/receive
history list registers is disabled.
1
Write access and read access to the message buffer register and the transmit/receive
history list registers is enabled.
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