MSM9225 datasheet(13/74 Pages) OKI

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MSM9225

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1. CAN control register (CANC: 0Ehex)

This register controls the operation of CAN.

The bit configuration is as follows:

76543210

Address MSB

0Eh

LSB

INIT : Initialize

TIRS : Transmission identifier retrieval

Not used

SYNC : Bit synchronization

CANA : CAN write flag

T x F : Transmission flag

R x F : Receive flag

Not used

(1) Initialize: INIT

This bit is used to initialize the communication control area. To start initialization, write

"1" to INIT, read INIT and confirm that INIT is "1", then initialize. To end initialization,

write "0" to INIT, read INIT, and confirm that INIT is "0". For both, initialization mode

is not set/cleared until the above procedure is executed.

If the INIT bit is set to "1" during the transmission or receive operation, the initialization

will start after the communication completes.

When the INIT bit is set to "1", the communication operation stops but the error counter

and data memory are held.

To initialize message memory, write the number of messages to be used to the number

of messages setting register, NMES, then write the inside message control register,

identifier 1, and identifier 2 sequentially from message 0 for all messages.

At reset, INIT is set to "1".

(2) Transmission identifier retrieval: TIRS

This bit is used to scan identifiers sequentially from message 0 to the last message of the

message memory, detecting priority of the message for which the transmission request

TRQ is "1" and starting to transmit the messages. TIRS will be set to "0" when there are

no transmission request messages after scanning or transmitting.

At reset, TIRS is set to "0".

(3) Bit synchronization: SYNC

This bit is used to set the bit synchronization edge to synchronize at the CAN bus.

When SYNC is "0", the synchronization edge is set at the falling edge of data.

When SYNC is "1", the synchronization edge is set at both the rising and falling edges of

data.

At reset, SYNC is set to "0".

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