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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：	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
文件頁數(shù)：	850/1080頁
文件大?。?/td>	6965K
代理商：	UPD703270GF-XXX-JBT

CHAPTER 19 CAN CONTROLLER

User’s Manual U16541EJ4V0UD

19.10 Message Transmission

19.10.1 Message transmission

In all the operation modes, if the C0MCTRLm.TRQ bit is set to 1 in a message buffer that satisfies the following

conditions, the message buffer that is to transmit a message is searched.

Used as a message buffer

(C0MCONFm.MA0 bit set to 1.)

Set as a transmit message buffer

(C0MCONFm.MT2 to C0MCONFm.MT0 bits set to 000B.)

Ready for transmission

(C0MCTRLm.RDY bit is set to 1.)

m = 00 to 31

The CAN system is a multi-master communication system.

In a system like this, the priority of message

transmission is determined based on message identifiers (IDs). To facilitate transmission processing by software

when there are several messages awaiting transmission, the CAN module uses hardware to check the ID of the

message with the highest priority and automatically identifies that message. This eliminates the need for software-

based priority control.

Transmission priority is controlled by the identifier (ID).

Figure 19-30. Message Processing Example

The CAN module transmits messages in the following sequence.

Message waiting to be transmitted

1. Message 6

2. Message 1

3. Message 8

4. Message 5

5. Message 2

After the transmit message search, the transmit message with the highest priority of the transmit message buffers

that have a pending transmission request (message buffers with the TRQ bit set to 1 in advance) is transmitted.

If a new transmission request is set, the transmit message buffer with the new transmission request is compared

with the transmit message buffer with a pending transmission request. If the new transmission request has a higher

priority, it is transmitted, unless transmission of a message with a low priority has already started. If transmission of a

message with a low priority has already started, however, the new transmission request is transmitted later. The

highest priority is determined according to the following rules.

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