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型號(hào)：	UPD70F3357GJ(A)-GAE-AX
元件分類(lèi)：	微控制器/微處理器
英文描述：	32-BIT, FLASH, 32 MHz, RISC MICROCONTROLLER, PQFP144
封裝：	20 X 20 MM, LEAD FREE, PLASTIC, LQFP-144
文件頁(yè)數(shù)：	935/1119頁(yè)
文件大?。?/td>	6653K
代理商：	UPD70F3357GJ(A)-GAE-AX

CHAPTER 19 CAN CONTROLLER

User’s Manual U17790EJ2V0UD

19.10.4 Transmission abort process

m = 00 to 31

(1) Transmission abort in normal operation mode

The user can clear the CnMCTRLm.TRQ bit to 0 to abort a transmission request. The TRQ bit will be cleared

immediately if the abort was successful. Whether the transmission was successfully aborted or not can be

checked using the CnCTRL.TSTAT bit and the CnTGPT register, which indicate the transmission status on the

CAN bus (for details, refer to the processing in Figure 19-45).

(2) Transmission abort process except for ABT transmission in normal operation mode with automatic

block transmission (ABT)

The user can clear the CnGMABT.ABTTRG bit to 0 to abort a transmission request. After checking the

ABTTRG bit of the CnGMABT register = 0, clear the CnMCTRLm.TRQ bit to 0. The TRQ bit will be cleared

immediately if the abort was successful. Whether the transmission was successfully aborted or not can be

checked by using the CnCTRL.TSTAT bit and the CnTGPT register, which indicate the transmission status on

the CAN bus (for details, refer to the process in Figure 19-46).

(3) Transmission abort in normal operation mode with automatic block transmission (ABT)

To abort ABT that is already started, clear the CnGMABT.ABTTRG bit 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 19-47). If the TRQ bit is cleared to 0 when clearing the ABTTRG bit is requested, the

internal ABT pointer is increased in increments of 1 and indicates the next message buffer in the ABT area (for

details, refer to the process in Figure 19-47).

Be sure to abort ABT by clearing the ABTTRG bit to 0. The operation is not guaranteed if

aborting transmission is requested by clearing RDY.

When the normal operation mode with ABT is resumed after ABT has been aborted and the ABTTRG bit is set

to 1, the next ABT message buffer to be transmitted can be determined from the following table.

Status of TRQ of ABT Message Buffer

Abort After Successful Transmission

Abort After Erroneous Transmission

Next message buffer in the ABT area

Same message buffer in the ABT area

Next message buffer in the ABT area

Next message buffer in the ABT area

The above resumption operation can be performed only if a message buffer ready for ABT exists in the

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 the ABTTRG bit is cleared to 0. If the CnMCTRLm.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 the ABTTRG bit is set to 1, and ABT ends immediately.

m = 00 to 31

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