MCP25050-E/SL 데이터 시트보기 (PDF) - Microchip Technology

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MCP25050-E/SL

Stand-Alone CAN Controller

Microchip Technology 

MCP2502X/5X

4.4.3 TRANSMIT MESSAGE PRIORITY

There is a priority for all transmit messages, including

TXIDn and all “Output” messages.

The transmit message priority is as follows:

1. Output messages have the highest priority.

Prioritization of the individual output message

types is determined by the three bits that

determine message type, with the lowest value

having the highest priority (e.g., Read A/D Regs

is a higher priority than Read Control Regs).

2. TXID2 (Transmit auto-converted messages) has

the second-highest priority.

3. TXID1 (Command acknowledge) has the third-

highest priority.

4. TXID0 (On Bus message) has the lowest

priority.

In the event two or more messages are pending

transmission, transmit-message-prioritization will occur

and the highest message type will be sent first.

Messages that are currently transmitting will not be

prioritized.

DS21664D-page 24

© 2007 Microchip Technology Inc.

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