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MCP2515-E/ML датащи(PDF) 5 Page - Microchip Technology |
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MCP2515-E/ML датащи(HTML) 5 Page - Microchip Technology |
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5 / 92 page ![]() 2003-2012 Microchip Technology Inc. DS21801G-page 5 MCP2515 1.4 Transmit/Receive Buffers/Masks/ Filters The MCP2515 has three transmit and two receive buffers, two acceptance masks (one for each receive buffer) and a total of six acceptance filters. Figure 1-3 shows a block diagram of these buffers and their connection to the protocol engine. FIGURE 1-3: CAN BUFFERS AND PROTOCOL ENGINE BLOCK DIAGRAM Acceptance Filter RXF2 R X B 1 Identifier Data Field Data Field Identifier Acceptance Mask RXM1 Acceptance Filter RXF3 Acceptance Filter RXF4 Acceptance Filter RXF5 M A B Acceptance Filter RXF0 Acceptance Filter RXF1 R X B 0 TXB2 Message Queue Control Transmit Byte Sequencer TXB0 CRC<14:0> Comparator Receive<7:0> Transmit<7:0> Receive Error Transmit Error Protocol REC TEC ErrPas BusOff Finite State Machine Counter Counter Shift<14:0> {Transmit<5:0>, Receive<8:0>} Transmit Logic Bit Timing Logic TX RX Configuration Registers Clock Generator PROTOCOL ENGINE BUFFERS TXB1 Acceptance Mask RXM0 A c c e p t A c c e p t SOF |
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