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Rev.1.10 Jul 01, 2005 page 217 of 318
REJ09B0124-0110
M16C/6N Group (M16C/6NK, M16C/6NM) 18. CAN Module
Under development
This document is under development and its contents are subject to change.
18.8 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 18.2 shows the examples of bit-rate.
Table 18.2 Examples of Bit-rate
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)
NOTE:
1. The number in ( ) indicates a value of “fCAN division value” multiplied by “baud rate prescaler division value”.
Bit-rate 24MHz 20MHz 16MHz 10MHz 8MHz
1Mbps 12Tq (1) 10Tq (1) 8Tq (1)
--
500kbps 12Tq (2) 10Tq (2) 8Tq (2) 10Tq (1) 8Tq (1)
24Tq (1) 20Tq (1) 16Tq (1)
--
125kbps 12Tq (8) 10Tq (8) 8Tq (8) 10Tq (4) 8Tq (4)
16Tq (6) 20Tq (4) 16Tq (4) 20Tq (2) 16Tq (2)
24Tq (4)
----
83.3kbps 12Tq (12) 10Tq (12) 8Tq (12) 10Tq (6) 8Tq (6)
16Tq (9) 20Tq (6) 16Tq (6) 20Tq (3) 16Tq (3)
24Tq (6)
----
33.3kbps 12Tq (30) 10Tq (30) 8Tq (30) 10Tq (15) 8Tq (15)
24Tq (15) 20Tq (15) 16Tq (15)
--