M32CSLASH86 datasheet(354/505 Pages) RENESAS

354 / 505 page

Page 331

23. CAN Module

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23.1.9 CANi Transmit Error Count Register (CiTEC Register) (i=0, 1)

CANi Transmit Error Count Register (i=0, 1)

Symbol

Address

After Reset(1)

C0TEC

020A16

0016

C1TEC

028A16

0016

Function

Counter value of transmission errors

NOTES:

1. Value is obtained by setting the SLEEP bit in the CiSLPR register to "1" (sleep mode exited) after

reset and supplying the clock to the CAN module.

CANi Receive Error Count Register (i=0, 1)

Symbol

Address

After Reset(1)

C0REC

020B16

0016

C1REC

028B16

0016

Function

Counter value of receive error

NOTES:

1. Value is obtained by setting the SLEEP bit in the CiSLPR register to "1" (sleep mode exited) after

reset and supplying the clock to the CAN module.

Figure 23.11 C0TEC and C1TEC Registers

In an error active or an error passive state, the counting value of a transmission error is stored into

the CiTEC register. The counter is decremented when the CAN module has transmitted data as

expected or is incremented when an transmit error occurs.

In a bus-off state, an indeterminate value is stored into the CiTEC register. The CiTEC register is set

to "0016" when the CAN module is placed in an error active state again.

23.1.10 CANi Receive Error Count Register (CiREC Register) (i=0, 1)

Figure 23.12 C0REC and C1REC Registers

In an error active or an error passive state, a counting value of the reception error is stored into the

CiREC register. The counter is decremented when the CAN module has received data as expected

or it is incremented when a receive error occurs.

The CiREC register is set to 127 when the CiREC register is 128 (error passive state) or more and

the CAN module has received as expected.

In a bus-off state, an indeterminate value is stored into the CiREC register. The CiREC register is set

to "0016" when the CAN module is placed in an error active state again.

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