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MCP25020I/P Datasheet(PDF) 24 Page - Microchip Technology |
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MCP25020I/P Datasheet(HTML) 24 Page - Microchip Technology |
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24 / 66 page  MCP2502X/5X DS21664D-page 24 © 2007 Microchip Technology Inc. 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. |
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