M32C85 Datasheet, PDF (355/542 Pages) Renesas Technology Corp – 16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES

M32C/85 Group (M32C/85, M32C/85T)
23. CAN Module
23.1.6.1 SAM Bit
The SAM bit determines the number of sample points to be taken per bit.
When the SAM bit is set to "0", only one sample is taken per bit at the end of the Phase Buffer
Segment 1 (PBS1) to determine the value of the bit.
When the SAM bit is set to "1", three samples per bit are taken; one time quantum and two time
quanta before the end of PBS1, and at the end of PBS1. The sample result value which is detected
more than twice becomes the value of the bit sampled.
23.1.6.2 PTS2 to PTS0 Bits
The PTS2 to PTS0 bits determine PTS width.
23.1.6.3 PBS12 to PBS10 Bits
The PBS12 to PBS10 bits determine PBS1 width. Set the PBS12 to 10 bits to "0012" or more.
23.1.6.4 PBS22 to PBS20 Bits
The PBS22 to PBS20 bits determine PBS2 width. Set the PBS22 to PBS20 bits to "0012" or more.
23.1.6.5 SJW1 and SJW0 Bits
The SJW1 and SJW0 bits determine SJW width. Set the SJW1 and SJW0 bits to values less than or
equal to the PBS12 to PBS10 bit settings and the PBS22 to PBS20 bit settings.
Table 23.3 Bit Timing when CPU Clock = 30 MHz
Baud Rate BRP Tq Clock Cycles (ns) Tq Per Bit
1Mbps
1
66.7
15
1
66.7
15
1
66.7
15
2
100
10
2
100
10
2
100
10
500Kbps
2
100
20
2
100
20
2
100
20
3
133.3
15
3
133.3
15
3
133.3
15
4
166.7
12
4
166.7
12
4
166.7
12
5
200
10
5
200
10
5
200
10
PTS+PBS1
12
11
10
7
6
5
16
15
14
12
11
10
9
8
7
7
6
5
PBS2
2
3
4
2
3
4
3
4
5
2
3
4
2
3
4
2
3
4
Sample Point
87%
80%
73%
80%
70%
60%
85%
80%
75%
87%
80%
73%
83%
75%
67%
80%
70%
60%
Rev. 1.03 Jul. 01, 2005 ^{Page 332} of 494
REJ09B0037-0103