UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 651

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

Note There is a possibility of starting the transmission without being aborted even if TRQ bit is cleared,
Cautions 1.
because the transmission request to protocol layer might already been accepted between 11 bits,
total of interframe space (3 bits) and suspend transmission (8 bits).
Figure 15-48. Transmission Abort Processing Except for ABT Transmission
2.
3.
4.
Execute transmission request abort processing by clearing the TRQ bit, not the RDY
bit.
Before making a sleep mode transition request, confirm that there is no transmission
request left using this processing.
The TSTAT bit can be periodically checked by a user application or can be checked
after the transmit completion interrupt.
Do not execute the new transmission request including in the other message buffers
while transmission abort processing is in progress.
be aborted matches C0LOPT
Wait for 11 CAN data bits
Transmission successful
Transmission successful
Read C0LOPT register
Clear ABTTRG bit
Message buffer to
ABTTRG = 0?
Clear TRQ bit
TSTAT = 0?
register?
START
(Normal Operation Mode with ABT)
END
Preliminary User’s Manual U19748EJ1V0UD
CHAPTER 15 CAN CONTROLLER
Yes
Yes
Yes
Note
No
No
No
Transmit abort request
Transmit abort request
was successful
was successful
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