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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1239 of 1441
NXP Semiconductors
UM10503
Chapter 45: LPC43xx/LPC43Sxx C_CAN
Remark:
The busoff recovery sequence (see
CAN Specification Rev. 2.0
) cannot be
shortened by setting or resetting the INIT bit. If the device goes into busoff state, it will set
INIT, stopping all bus activities. Once INIT has been cleared by the CPU, the device will
then wait for 129 occurrences of Bus Idle (129
11 consecutive HIGH/recessive bits)
before resuming normal operations. At the end of the busoff recovery sequence, the Error
Management Counters will be reset.
During the waiting time after the resetting of INIT, each time a sequence of 11
HIGH/recessive bits has been monitored, a Bit0Error code is written to the Status Register
CANSTAT, enabling the CPU to monitor the proceeding of the busoff recovery sequence
and to determine whether the CAN bus is stuck at LOW/dominant or continuously
disturbed.
6
CCE
Configuration change enable
0
R/W
0
The CPU has no write access to the bit timing
register.
1
The CPU has write access to the CANBT
register while the INIT bit is one.
7
TEST
Test mode enable
0
R/W
0
Normal operation.
1
Test mode.
31:8
-
reserved
-
-
Table 1036.CAN control registers (CNTL, address 0x400E 2000 (C_CAN0) and 0x400A 4000
(C_CAN1)) bit description
…continued
Bit
Symbol Value
Description
Reset
value
Access