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MCP2510-ISO Datasheet(PDF) 16 Page - Microchip Technology |
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MCP2510-ISO Datasheet(HTML) 16 Page - Microchip Technology |
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16 / 80 page  MCP2510 DS21291F-page 16 © 2007 Microchip Technology Inc. Only messages that have not already begun to be transmitted can be aborted. Once a message has begun transmission, it will not be possible for the user to reset the TXBnCTRL.TXREQ bit. After transmission of a message has begun, if an error occurs on the bus or if the message loses arbitration, the message will be retransmitted regardless of a request to abort. FIGURE 3-1: TRANSMIT MESSAGE FLOWCHART Start Is CAN Bus available to start transmission No Examine TXBnCTRL.TXP <1:0> to Are any TXBnCTRL.TXREQ ? bits = 1 The message transmission sequence begins when the device determines that the TXBnCTRL.TXREQ for any of the transmit registers has been set. Clear: TXBnCTRL.ABTF TXBnCTRL.MLOA TXBnCTRL.TXERR Yes ? is TXBnCTRL.TXREQ=0 CANCTRL.ABAT=1 Clearing the TxBnCTRL.TXREQ bit while it is set, or setting the CANCTRL.ABAT bit before the message has started transmission will abort the message. No Transmit Message Was Message Transmitted Successfully? No Yes Set TxBnCTRL.TXREQ=0 CANINTE.TXnIE=1? Generate Interrupt Yes Yes Yes Set Did a message error occur? Was Arbitration lost during transmission? Set TxBnCTRL.TXERR=1 Yes No No Determine Highest Priority Message No ? TxBnCTRL.MLOA=1 The CANINTE.TXnIE bit determines if an interrupt should be generated when a message is successfully transmitted. GOTO START CANTINF.TXnIF=1 Yes No |
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Similar Description - MCP2510-ISO |
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