TMPR3916 datasheet(146/225 Pages) TOSHIBA

146 / 225 page

Chapter 7 CAN Module (TXCAN)

Preliminary

7-25

7.4

TXCAN Operation Modes

7.4.1

Configuration Mode

The TXCAN has to be initialized before activation. The bit timing parameters can only be modified

when the module is in configuration mode. After reset, the configuration mode is active and the CCR

bit of MCR and the CCE bit of GSR are set to “1”. The TXCAN could be set to normal operation mode

by writing a “0” to CCR. After leaving configuration mode, the CCE bit will be set to “0” and the

power-up sequence will start. The power-up sequence consists of detecting eleven consecutive recessive

bits on the CAN bus line. After the power-up sequence, TXCAN is bus on and ready for operation.

To enter configuration mode from normal operation mode the change configuration request bit (CCR)

has to be set to “1”. After the TXCAN has entered configuration mode, the change configuration enable

bit (CCE) will be set to “1”. See also the following flowchart.

When the TXCAN enters configuration mode the error counters, the time stamp counter and the time

stamp hold register will be cleared.

TXCAN is in configuration

mode: CCR=1 & CCE=1

Normal

operation

requested?

Set CCR to “0”

Yes

Switch to configuration

mode from normal

operation mode

Initialize TXCAN

after reset

Set bit timing

parameters in BCR1 &

BCR2

CCE = 0 ?

Yes

TXCAN is in normal

operation mode and

starts power-up

sequence

11 consecutive

recessive bits

detected?

TXCAN is bus on and

ready for operation

TXCAN is in normal

operation mode:

CCR=0 & CCE=0

Configuration

mode requested?

Yes

Set CCR to “1”

CCE = 1 ?

Yes

Figure 7.4.1 Configuration Flow Chart for TXCAN

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