TMPR3916 datasheet(150/225 Pages) TOSHIBA

150 / 225 page

Chapter 7 CAN Module (TXCAN)

Preliminary

7-29

7.4.5

Test Error Mode

The error counters can only be written when TXCAN is in test error mode.

The “test error mode” shall only be enabled or disabled when TXCAN is in suspend mode. Figure

7.4.2 shows the set-up procedure.

When TXCAN is in “test error mode” both error counters will be written at the same time with the

same value. The maximum value that can be written into the error counters is 255. Thus, the error

counter value of 256 which forces TXCAN into bus off mode can not be written into the error counters.

7.4.6

Special Modes for Dual Channel CAN

•

Modifications due to adding a second CAN Channel

•

Bits are required from the CCR register.

•

SingleChannelEmu and CanTstInternal. Setting the CanTstInternal to “1” switches to an internal

testmode, which is a internal connection independent from any external pins or transceivers.

Internal Test Mode

TXCAN1

TXCAN2

RXCAN1

RXCAN2

CHIP Border

Figure 7.4.3 Internal Test Mode

•

The Signal “SingleChannelEmu” connects 2 channels to be able to work on only 1 transceiver.

Single Transceiver Mode

TXCAN1

TXCAN2

RXCAN1

Transceiver

RXCAN2

CHIP Border

Figure 7.4.4 Single Transceiver Mode

The following table shows the bit function of CANM in the Chip Configuration Register (CCR):

CANM

CAN Mode

Normal operation

Internal Test mode

1 Transceiver - Mode

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