MSMR

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Interpret as MSMR

MBSM=00

Mailbox Search Mode Register

MBSM	Mailbox Search Mode Select 0 (00): Receive mailbox search mode 1 (01): Transmit mailbox search mode 2 (10): Message lost search mode 3 (11): Channel search mode
Reserved	These bits are read as 000000. The write value should be 000000.

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