TCAN4550-Q1: MCAN core configuration

QJ Wang

Guru**** 196156 points

Part Number: TCAN4550-Q1

Hello Experts,

The datasheet of TCAN4550-Q1 says that the CAN FD Register Set can only be updated in Standby Mode with MCAN_CONFIG=0, or in Normal Mode. I did the following tests

1. Normal mode with MCAN_CONFIG=1

Configure CCCR (value with INIT=1 and CCE=1) -- works

Clear INIT and CCE bits -- works

2. Standby mode with MCAN_CONFIG=0

Configure CCCR (value with INIT=1 and CCE=1) -- works

Clear INIT and CCE bits -- failed

My question is how to configure MCAN core in standby mode.

over 6 years ago

0 Miguel Robertson over 6 years ago

TI__Guru 62920 points

Hi QJ,

These bits are actually forced high in standby mode and cannot be cleared, and so what you have reported is expected behavior. This allows for writes to the protected registers while in standby mode. The bits are cleared upon transition to normal mode, re-enabling the write protection. Let me know if this isn't clear.

Best regards,
Max

0 QJ Wang over 6 years ago in reply to Miguel Robertson

TI__Guru**** 196156 points

Thanks Max

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TCAN4550-Q1: MCAN core configuration