
Rev.2.10 Apr 14, 2006 page 238 of 378
REJ09B0124-0210
M16C/6N Group (M16C/6NK, M16C/6NM) 19. CAN Module
19.8 Bit-rate
Bit-rate depends on f1, the division value of the CAN module system clock, the division value of the baud
rate prescaler, and the number of Tq of one bit.
Table 19.2 shows the Examples of Bit-rate.
Table 19.2 Examples of Bit-rate
19.8.1 Calculation of Bit-rate
f1
2 ✕ “fCAN division value
(1)
” ✕ “baud rate prescaler division value
(2)
” ✕ “number of Tq of one bit”
NOTES:
1. fCAN division value = 1, 2, 4, 8, 16
fCAN division value: a value selected in the CCLKR register
2. Baud rate prescaler division value = P + 1 (P: 0 to 15)
P: a value selected in the BRP bit in the CiCONR register (i = 0, 1)
NOTES:
1. The number in ( ) indicates a value of “fCAN division value” multiplied by “baud rate prescaler division value”.
2. 24 MHz is available Normal-ver. only.
Bit-rate 24 MHz
(2)
20 MHz 16 MHz 10 MHz 8 MHz
1 Mbps 12 Tq (1) 10 Tq (1) 8 Tq (1)
--
500 kbps 8 Tq (3) 10 Tq (2) 8 Tq (2) 10 Tq (1) 8 Tq (1)
12 Tq (2) 20 Tq (1) 16 Tq (1)
--
24 Tq (1)
----
125 kbps 8 Tq (12) 8 Tq (10) 8 Tq (8) 8 Tq (5) 8 Tq (4)
12 Tq (8) 10 Tq (8) 16 Tq (4) 10 Tq (4) 16 Tq (2)
16 Tq (6) 16 Tq (5)
-
20 Tq (2)
-
24 Tq (4) 20 Tq (4)
---
83.3 kbps 8 Tq (18) 8 Tq (15) 8 Tq (12) 10 Tq (6) 8 Tq (6)
12 Tq (12) 10 Tq (12) 16 Tq (6) 20 Tq (3) 16 Tq (3)
16 Tq (9) 20 Tq (6)
---
24 Tq (6)
----
33.3 kbps 10 Tq (36) 10 Tq (30) 8 Tq (30) 10 Tq (15) 8 Tq (15)
12 Tq (30) 20 Tq (15) 10 Tq (24)
-
10 Tq (12)
20 Tq (18)
-
16 Tq (15)
-
20 Tq (6)
24 Tq (15)
-
20 Tq (12)
--
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