When CTRL2[TIMER_SRC] is negated, the timer is incremented by the CAN bit clock,
which defines the baud rate on the CAN bus. During a message transmission/reception, it
increments by one for each bit that is received or transmitted. When there is no message
on the bus, it counts using the previously programmed baud rate. The timer is not
incremented during Disable , Stop, Pretended Networking, and Freeze modes.
The timer value is captured when the second bit of the identifier field of any frame is on
the CAN bus. This captured value is written into the time stamp entry in a message buffer
after a successful reception or transmission of a message.
If CTRL1[TSYN] is asserted, the timer is reset whenever a message is received in the
first available mailbox, according to CTRL2[RFFN] setting.
The CPU can write to this register anytime. However, if the write occurs at the same time
that the timer is being reset by a reception in the first mailbox, then the write value is
discarded.
Reading this register affects the mailbox unlocking procedure (see
49.4.2.4.3 Diagram
Bits
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bits
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
49.4.2.4.4 Fields
Field
Function
31-16
—
Reserved
15-0
TIMER
Timer Value
Contains the free-running counter value.
Chapter 49 FlexCAN
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
1585
Содержание MWCT101 S Series
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