XC886/888CLM
Controller Area Network (MultiCAN) Controller
User’s Manual
15-72
V1.3, 2010-02
MultiCAN, V1.0
The Node Frame Counter Register NFCRx contains the actual value of the frame
counter as well as control and status bits of the frame counter.
0
[31:26] r
Reserved
Read as 0; should be written with 0.
NFCRx (x = 0-1)
Node x Frame Counter Register
Reset Value: 0000 0000
H
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
0
CFC
OV
CFCI
E
0
CFMOD
CFSEL
r
rwh
rw
r
rw
rw
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CFC
rwh
Field
Bits
Type Description
CFC
[15:0]
rwh
CAN Frame Counter
In Frame Count Mode (CFMOD = 00
B
), this bit field contains
the frame count value.
In Time Stamp Mode (CFMOD = 01
B
), this bit field contains
the captured bit time count value, captured with the start of a
new frame.
In all Bit Timing Analysis Modes (CFMOD = 10
B
), CFC
always displays the number of
f
CAN
clock cycles
(measurement result) minus 1. Example: a CFC value of 34
in measurement mode CFSEL = 000
B
means that 35
f
CAN
clock cycles have been elapsed between the most recent two
dominant edges on the receive input.
Field
Bits
Type Description
*