HD64F36034 datasheet(358/592 Pages) RENESAS

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Section 15 Controller Area Network for Tiny (TinyCAN)

Rev. 4.00 Mar. 15, 2006 Page 326 of 556

REJ09B0026-0400

Time Quantum (TQ) is an integer multiple of the number of system clocks, and is determined by

the baud rate prescaler (BRP) as follows.

φ means the system clock frequency.

TQ = (BRP

+ 1)/φ

The following formula is used to calculate the 1-bit time and bit rate.

1-bit time = TQ

× {1 + (1 + TSG1) + (1 + TSG2)}

Bit rate = 1/Bit time

φ/{(BRP + 1) × {1 + (1 + TSG1) + (1 + TSG2)}}

Values that can be set for TSG1 and TSG2 in BCR1 are listed in table 15.3.

Table 15.3

Settable Values for TSG1 and TSG2 in BCR1

TSG2

001

010

011

100

101

110

111

TSG1

0011

Yes

0100

Yes

0101

Yes

0110

Yes

0111

Yes

1000

Yes

1001

Yes

1010

Yes

1011

Yes

1100

Yes

1101

Yes

1110

Yes

1111

Yes

[Legend]

Yes: Setting is possible

No:

Setting is prohibited

[Example]

To have a baud rate of 1 Mbps with

φ = 16 MHz, BRP = 1, and (1 + TSG1) + (1 + TSG2) = 7. In

this case, the settings are BCR1 = H

′23 and BCR0 = H'01.

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