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MCP2510-IST Datasheet(PDF) 23 Page - Microchip Technology |
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MCP2510-IST Datasheet(HTML) 23 Page - Microchip Technology |
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23 / 76 page  2000 Microchip Technology Inc. Preliminary DS21291C-page 23 MCP2510 FIGURE 4-2: Message Reception Flowchart Set RXBF0 Start Detect Start of Message ? Valid Message Received ? Generate Error Message Identifier meets a filter criteria ? Is CANINTF.RX0IF=0 ? Go to Start Move message into RXB0 Set RXB0CTRL.FILHIT <2:0> Is CANINTF.RX1IF = 0 ? Move message into RXB1 Set CANINTF.RX1IF=1 Yes, meets criteria for RXBO No Generate Interrupt on INT Yes Yes No No Yes Yes No No Yes Yes Frame The CANINTF.RXNIF bit determines if the receive register is empty and able to accept a new message No Yes No Begin Loading Message into Message Assembly Buffer (MAB) according to which filter criteria was met Set RXB0CTRL.FILHIT <0> according to which filter criteria Set CANSTAT <3:0> accord- ing to which receive buffer the message was loaded into Is RXB0CTRL.BUKT=1 ? The RXB0CTRL.BUKT bit determines if RXB0 can roll over into RXB1 Generate Overflow Error: Set EFLG.RX1OVR Is CANINTE.ERRIE=1 ? No Go to Start Yes No Are BFPCTRL.B0BFM=1 ? BF1CTRL.B0BFE=1 and Pin = 0 No Set RXBF1 Pin = 0 No Yes Yes CANINTE.RX0IE=1? CANINTE.RX1IE=1? RXB1 RXB0 Yes, meets criteria for RXB1 Set EFLG.RX0OVR Generate Overflow Error: Set CANINTF.RX0IF=1 Are BFPCTRL.B1BFM=1 ? BF1CTRL.B1BFE=1 and |
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