UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 472

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

16.10.5 Remote frame transmission
is transmitted via the RTR bit of the C0MCONFm register. Setting (1) the RTR bit sets remote frame transmission.
472
Remote frames can be transmitted only from transmit message buffers. Set whether a data frame or remote frame
(3) Transmission abort process for ABT transmission in normal operation mode with automatic block
Note The above resumption operation can be performed only if a message buffer ready for ABT exists in the
Remark m = 0 to 15
Set (1)
Cleared (0)
Remark
Status of TRQ of
ABT Message
transmission (ABT)
To abort ABT that is already started, clear the ABTTRG bit of the C0GMABT register to 0. In this case, the
ABTTRG bit remains 1 if an ABT message is currently being transmitted and until the transmission is
completed (successfully or not), and is cleared to 0 as soon as transmission is finished. This aborts ABT.
If the last transmission (before ABT) was successful, the normal operation mode with ABT is left with the
internal ABT pointer pointing to the next message buffer to be transmitted.
In the case of an erroneous transmission, the position of the internal ABT pointer depends on the status of
the TRQ bit in the last transmitted message buffer. If the TRQ bit is set to 1 when clearing the ABTTRG bit is
requested, the internal ABT pointer points to the last transmitted message buffer (for details, refer to the
process in Figure 16-49). If the TRQ bit is cleared to 0 when clearing the ABTTRG bit is requested, the
internal ABT pointer is incremented (+1) and points to the next message buffer in the ABT area (for details,
refer to the process in Figure 16-50).
When the normal operation mode with ABT is resumed after ABT has been aborted and ABTTRG bit is set to
1, the next ABT message buffer to be transmitted can be determined from the following table.
Caution
Buffer
ABT area. For example, an abort request that is issued while ABT of message buffer 7 is in progress is
regarded as completion of ABT, rather than abort, if transmission of message buffer 7 has been
successfully completed, even if ABTTRG is cleared to 0. If the RDY bit in the next message buffer in the
ABT area is cleared to 0, the internal ABT pointer is retained, but the resumption operation is not
performed even if ABTTRG is set to 1, and ABT ends immediately.
m = 0 to 15
Be sure to abort ABT by clearing ABTTRG to 0. The operation is not guaranteed if
aborting transmission is requested by clearing RDY bit.
Next message buffer in the ABT
area
Next message buffer in the ABT
area
Abort After Successful Transmission
Note
Note
CHAPTER 16 CAN CONTROLLER
User’s Manual U17554EJ4V0UD
Same message buffer in the ABT area
Next message buffer in the ABT area
Abort after erroneous transmission
Note