32186 datasheet(645/1032 Pages) RENESAS

645 / 1032 page

CAN MODULE

13-35

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

13.2.6 CAN Error Count Registers

CAN0 Receive Error Count Register (CAN0REC)

<Address: H’0080 100A>

CAN1 Receive Error Count Register (CAN1REC)

<Address: H’0080 140A>

123456

REC

00000000

Bit Name

Function

0–7

REC

Receive error count value

–

During an error active/error passive state, a receive error count value is stored in this register.

The count is decremented when frames are received normally or incremented when an error occurred. If the

CAN module finished receiving normally when REC

≥ 128 (error passive), REC is set to 127. During a bus off

state, an undefined value is stored in this register. The count is reset to H’00 upon returning to an error active

state.

CAN0 Transmit Error Count Register (CAN0TEC)

<Address: H’0080 100B>

CAN1 Transmit Error Count Register (CAN1TEC)

<Address: H’0080 140B>

b15

TEC

00000000

Bit Name

Function

8–15

TEC

Transmit error count value

–

During an error active/error passive state, a transmit error count value is stored in this register.

The count is decremented when frames are transmitted normally or incremented when an error occurred.

During a bus off state, an undefined value is stored in this register. The count is reset to H’00 upon returning to

an error active state.

13.2 CAN Module Related Registers

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