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CHAPTER 16 CAN controller
Table 16.3-10 Functions of Transmission Request Register (TREQR)
bit0
to
bit7
504
Bit name
TREQ7 to 0:
These bits starts transmitting for the message buffer (x).
Transmission request
When set to 0: No effect on operation
bits 7 to 0
When set to 1: Starts transmitting for message buffer (x)
- If more than one transmit complete bit is set (TREQx =
- These bits remain 1s during the transmit being
- Clearing a transmit request when transmitting is
Read using read modify write instructions: 1 always read
Setting of remote frame receive wait bit (RFWTR: RFWTx)
RFWTx bit = 0: Starts transmitting immediately. Even if RRTRx
bit in receive RTR register = 1.
RFWTx bit = 1: Starts transmitting after remote frame received.
Function
1), transmitting is started with the lower number of the
message buffer (x) that accepts the transmit request.
requested. These bits are cleared to 0 when transmitting
is completed or the transfer request is cancelled.
completed (TREQx = 0) overrides setting of the transmit
request bit when 0 is written (TREQx = 1) if both occur
at the same time.
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