TMPR3916 datasheet(149/225 Pages) TOSHIBA

149 / 225 page

Chapter 7 CAN Module (TXCAN)

Preliminary

7-28

7.4.4

Test Loop Back Mode

In this mode TXCAN can receive its own transmitted message and will generate its own

acknowledge bit. No other CAN node is necessary for the operation.

When the INTLB bit of the MCR register is “0”, the internal loop back is disabled. The supposition

that TXCAN receives its own messages is that the RX and TX lines must be connected to a CAN bus

transceiver or directly together.

When the INTLB bit of the MCR register is set to “1”, the internal loop back is enabled. In this case,

there is no need to connect the RX and TX lines together or to a CAN bus transceiver to make the

TXCAN able to receive its own messages.

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

following figure shows the set-up procedure.

In “test loop back mode” TXCAN can transmit a message from one mailbox and receive it in another

mailbox. The set-up for the mailboxes is the same as in normal operation mode.

Enable/disable

test loop back mode

and/or test error mode

Yes

TXCAN is in normal

operation mode:

CCR=0 & CCE=0,

SUR=0 & SUA=0

SUA = 1 ?

Suspend mode request:

set SUR to “1”

Back to normal

operation mode with

enabled/disabled TSTLB

and/or TSTERR:

set SUR to “0”

Setup TSTLB and/or

TSTERR bit:

“1” enable,

“0” disable

SUA = 0 ?

End of setup;

TXCAN is in normal

operation mode with

enabled/disabled test loop

back and/or test error mode

Yes

Figure 7.4.2 Internal Test Flow Chart

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