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MCP2510 Datasheet(PDF) 3 Page - Microchip Technology |
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MCP2510 Datasheet(HTML) 3 Page - Microchip Technology |
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3 / 76 page  2000 Microchip Technology Inc. Preliminary DS21291C-page 3 MCP2510 1.0 DEVICE FUNCTIONALITY 1.1 Overview The MCP2510 is a stand-alone CAN controller devel- oped to simplify applications that require interfacing with a CAN bus. A simple block diagram of the MCP2510 is shown in Figure 1-1. The device consists of three main blocks: 1. the CAN protocol engine, 2. the control logic and SRAM registers that are used to configure the device and its operation, and 3. the SPI protocol block. A typical system implementation using the device is shown in Figure 1-2. The CAN protocol engine handles all functions for receiving and transmitting messages on the bus. Mes- sages are transmitted by first loading the appropriate message buffer and control registers. Transmission is initiated by using control register bits, via the SPI inter- face, or by using the transmit enable pins. Status and errors can be checked by reading the appropriate reg- isters. Any message detected on the CAN bus is checked for errors and then matched against the user defined filters to see if it should be moved into one of the two receive buffers. The MCU interfaces to the device via the SPI interface. Writing to and reading from all registers is done using standard SPI read and write commands. Interrupt pins are provided to allow greater system flex- ibility. There is one multi-purpose interrupt pin as well as specific interrupt pins for each of the receive regis- ters that can be used to indicate when a valid message has been received and loaded into one of the receive buffers. Use of the specific interrupt pins is optional, and the general purpose interrupt pin as well as status registers (accessed via the SPI interface) can also be used to determine when a valid message has been received. There are also three pins available to initiate immediate transmission of a message that has been loaded into one of the three transmit registers. Use of these pins is optional and initiating message transmission can also be done by utilizing control registers accessed via the SPI interface. Table 1-1 gives a complete list of all of the pins on the MCP2510. FIGURE 1-1: Block Diagram 3 TX Buffers 2 RX Buffers Message Assembly 6 Acceptance Filters SPI Interface Logic SPI Bus INT Buffer CS SCK SI SO CAN Protocol Engine RXCAN TXCAN Control Logic RX0BF RX1BF TX0RTS TX1RTS TX2RTS |
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