MSM9225 datasheet(26/74 Pages) OKI

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MSM9225

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11. CAN status register (CANS: 9Fhex)

This is a status register to indicate the status of CAN.

Bit6 to bit4 are flags for the transmitter and bit1 and bit0 are for the receiver, and this register

is read only.

The bit configuration is shown below.

(1) Receiver Error Warning: REW

When the Receiver Error Counter (REC)

≥ 96, REW becomes "1". If REW = "1", the bus

may be seriously damaged. The bus must be tested for this condition.

At reset or when REC < 96, REW becomes "0".

(2) Receiver Error Passive: REP

When the Receive Error Counter (REC)

≥ 128, REP becomes "1".

At reset or when REC < 128, REP becomes "0" (error active)

(3) Transmitter Error Warning: TEW

When the Transmit Error Counter (TEC)

≥ 96, TEW becomes "1".

If TEW = "1", the bus may be seriously damaged. The bus must be tested for this

condition.

At reset or when TEC < 96, TEW becomes "0".

(4) Transmitter Error Passive: TEP

When the Transmit Error Counter (TEC) > 128, TEP becomes "1".

At reset or when TEP < 128, TEP becomes "0".

(5) Bus OFF: BOFF

This flag indicates the CAN bus status.

When the Transmit Error Counter (TEC) > 256 BOFF becomes "1" and the CAN bus is in

the BUS OFF state.

At reset or when TEP < 256, BOFF becomes "0".

76543210

Address MSB

9Fh

LSB

REW : Receiver Error Warning

REP : Receiver Error Passive

Not used

TEW : Transmitter Error Warning

TEP : Transmitter Error Passive

BOFF : Bus OFF flag

Not used

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