MSM9225 查看數據表（PDF） - Oki Electric Industry

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产品描述 (功能)

生产厂家

MSM9225

CAN (Controller Area Network) Controller

Oki Electric Industry 

¡ Semiconductor

MSM9225

5. CAN bus timing register 1 (BTR1: 2Ehex)

This register sets the sampling count, sampling point and transmit point used for bus timing.

Writing to the BTR1 bit is enabled, when the INIT bit of the CAN control register (CANC:

0Ehex) is "1".

The bit configuration is as follows:

Address MSB

LSB

2Eh

76543210

TSEG10 :

TSEG11 :

TSEG12 :

TSEG13 :

TSEG20 :

TSEG21 :

TSEG22 :

Not used :

Time

segment 1

Time

segment 2

(1) Time segment 1: TSEG13 to TSEG10

This is a 4-bit register to set the sampling point.

The relationship between bit content and TSEG1 is as follows:

At reset, TSEG13 to TSEG10 are set to "0000".

TSEG13

0

0

·

·

1

1

TSEG12

0

0

·

·

1

1

TSEG11

0

0

·

·

1

1

TSEG10

0

1

·

·

0

1

TSEG1

1 ¥ BTL cycle

2 ¥ BTL cycle

·

·

15 ¥ BTL cycle

16 ¥ BTL cycle

(2) Time segment 2: TSEG22 to TSEG20

This is a 3-bit register to set the transmit point.

The relationship between the bit content and TSEG2 is as follows:

At reset, TSEG22 to TSEG20 are set to "000".

TSEG22

0

0

·

·

1

1

TSEG21

0

0

·

·

1

1

TSEG20

0

1

·

·

0

1

TSEG2

1 ¥ BTL cycle

2 ¥ BTL cycle

·

·

7 ¥ BTL cycle

8 ¥ BTL cycle

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