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您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄200645 > UPD703270GF-XXX-JBT 32-BIT, MROM, 20 MHz, RISC MICROCONTROLLER, PQFP100 PDF資料下載

型號(hào)：	UPD703270GF-XXX-JBT
元件分類：	微控制器/微處理器
英文描述：	32-BIT, MROM, 20 MHz, RISC MICROCONTROLLER, PQFP100
封裝：	14 X 20 MM, PLASTIC, QFP-100
文件頁(yè)數(shù)：	855/1080頁(yè)
文件大小：	6965K
代理商：	UPD703270GF-XXX-JBT

CHAPTER 19 CAN CONTROLLER

User’s Manual U16541EJ4V0UD

Cautions 1. To resume the normal operation mode with ABT from the message buffer 0, set the

ABTCLR bit to 1 while the ABTTRG bit is cleared to 0. If the ABTCLR bit is set to 1 while

the ABTTRG bit is set to 1, the subsequent operation is not guaranteed.

2. If the automatic block transmission engine is cleared by setting the ABTCLR bit to 1, the

ABTCLR bit is automatically cleared immediately after the processing of the clearing

request is completed.

3. Do not set the ABTTRG bit in the initialization mode.

If the ABTTRG bit is set in the

initialization mode, the proper operation is not guaranteed after the mode is changed from

the initialization mode to the ABT mode.

4. Do not set the TRQ bit of the ABT message buffers to 1 by software in the normal

operation mode with ABT. Otherwise, the operation is not guaranteed.

5. The C0GMABTD register is used to set the delay time that is inserted in the period from

completion of the preceding ABT message to setting of the TRQ bit for the next ABT

message when the transmission requests are set in the order of message numbers for

each message for ABT that is successively transmitted in the ABT mode. The timing at

which the messages are actually transmitted onto the CAN bus varies depending on the

status of transmission from other stations and the status of the setting of the transmission

request for messages other than the ABT messages (message buffers 8 to 31).

6. If a transmission request is made for a message other than an ABT message and if no

delay time is inserted in the interval in which transmission requests for ABT are

automatically set (C0GMABTD register = 00H), messages other than ABT messages may

be transmitted regardless of their priority in regards to the ABT message.

7. Do not clear the RDY bit to 0 when the ABTTRG bit = 1.

8. If a message is received from another node in the normal operation mode with ABT, the

message may be transmitted after the time of one frame has elapsed even when

C0GMABTD register = 00H.

m = 00 to 31

19.10.4 Transmission abort process

m = 00 to 31

(1) Transmission abort in normal operation mode

The user can clear the C0MCTRLm.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 C0CTRL.TSTAT bit and the C0TGPT 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 C0GMABT.ABTTRG bit to 0 to abort a transmission request. After checking the

ABTTRG bit of the C0GMABT register = 0, clear the C0MCTRLm.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 C0CTRL.TSTAT bit and the C0TGPT register, which indicate the transmission status on

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

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