TMPR3916 datasheet(142/225 Pages) TOSHIBA

142 / 225 page

Chapter 7 CAN Module (TXCAN)

Preliminary

7-21

Bit

Name

Function

Reset

Value

Mode

Bus Off status

1 = There is an abnormal rate of occurrences of errors on the CAN

bus. This condition occurs when the transmit error counter TEC

has reached the limit of 256. During “bus off”, no messages can

be received or transmitted. The CAN module will go to “bus on”

automatically after the “bus off recovery sequence”. After

entering “bus off”, the error counters are undefined.

0 = Normal operation

Error Passive status

1 = The CAN module is in the error passive mode.

0 = The CAN module is in the error active mode.

Warning status

1 = At least one of the error counters has reached the warning level

of 97.

0 = Both values of the error counters are less than 97.

CAN Error Counter Register (CEC)

Bit

Name

TEC

REC

Bit

Name

Function

Reset

Value

Mode

15:8

TEC

Transmit error counter

7:0

REC

Receive error counter

The CAN module contains two error counters: receive error counter (REC) and transmit error counter

(TEC). The values of both counters can be read via the MCU interface. These counters are incremented

or decremented according to the CAN specification version 2.0B. A write access to the error counters is

only possible in the test error mode (TSTERR bit in MCR is set). In this mode both the TEC and REC

counters take over the value written to the lower byte of the register.

The receive error counter is not increased after exceeding the error passive limit (128). After the

correct reception of a message, the counter is set to a value between 119 and 127 (see CAN

specification). After reaching the “bus off” status, the error counters are undefined.

If the status “bus off” is reached, the receive error counter is incremented after 11 consecutive

recessive bits on the bus. These 11 bits correspond to the gap between two telegrams on the bus. If the

counter reaches the count 128, the module changes automatically to the status error active. All internal

flags are reset and the error counters are deleted. The configuration registers keep the programmed

values. The values of the error counters are undefined during “bus off” status.

When TXCAN enters configuration mode (see paragraph “7.4.1 Configuration Mode”) the error

counters will be cleared.

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