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MCP2510-ISO Datasheet(PDF) 57 Page - Microchip Technology |
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MCP2510-ISO Datasheet(HTML) 57 Page - Microchip Technology |
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57 / 80 page  © 2007 Microchip Technology Inc. DS21291F-page 57 MCP2510 11.0 SPI INTERFACE 11.1 Overview The MCP2510 is designed to interface directly with the Serial Peripheral Interface (SPI) port available on many microcontrollers and supports Mode 0,0 and Mode 1,1. Commands and data are sent to the device via the SI pin, with data being clocked in on the rising edge of SCK. Data is driven out by the MCP2510, on the SO line, on the falling edge of SCK. The CS pin must be held low while any operation is performed. Table 11-1 shows the instruction bytes for all operations. Refer to Figure 11-8 and Figure 11-9 for detailed input and out- put timing diagrams for both Mode 0,0 and Mode 1,1 operation. 11.2 Read Instruction The Read Instruction is started by lowering the CS pin. The read instruction is then sent to the MCP2510 fol- lowed by the 8-bit address (A7 through A0). After the read instruction and address are sent, the data stored in the register at the selected address will be shifted out on the SO pin. The internal address pointer is automat- ically incremented to the next address after each byte of data is shifted out. Therefore it is possible to read the next consecutive register address by continuing to pro- vide clock pulses. Any number of consecutive register locations can be read sequentially using this method. The read operation is terminated by raising the CS pin (Figure 11-2). 11.3 Write Instruction The Write Instruction is started by lowering the CS pin. The write instruction is then sent to the MCP2510 fol- lowed by the address and at least one byte of data. It is possible to write to sequential registers by continuing to clock in data bytes, as long as CS is held low. Data will actually be written to the register on the rising edge of the SCK line for the D0 bit. If the CS line is brought high before eight bits are loaded, the write will be aborted for that data byte, previous bytes in the command will have been written. Refer to the timing diagram in Figure 11-3 for more detailed illustration of the byte write sequence. 11.4 Request To Send (RTS) Instruction The RTS command can be used to initiate message transmission for one or more of the transmit buffers. The part is selected by lowering the CS pin and the RTS command byte is then sent to the MCP2510. As shown in Figure 11-4, the last 3 bits of this command indicate which transmit buffer(s) are enabled to send. This command will set the TxBnCTRL.TXREQ bit for the respective buffer(s). Any or all of the last three bits can be set in a single command. If the RTS command is sent with nnn = 000, the command will be ignored. 11.5 Read Status Instruction The Read Status Instruction allows single instruction access to some of the often used status bits for mes- sage reception and transmission. The part is selected by lowering the CS pin and the read status command byte, shown in Figure 11-6, is sent to the MCP2510. After the command byte is sent, the MCP2510 will return eight bits of data that contain the status. If additional clocks are sent after the first eight bits are transmitted, the MCP2510 will continue to output the status bits as long as the CS pin is held low and clocks are provided on SCK. Each status bit returned in this command may also be read by using the standard read command with the appropriate regis- ter address. 11.6 Bit Modify Instruction The Bit Modify Instruction provides a means for setting or clearing individual bits in specific status and control registers. This command is not available for all regis- ters. See Section 10.0 (register map) to determine which registers allow the use of this command. The part is selected by lowering the CS pin and the Bit Modify command byte is then sent to the MCP2510. After the command byte is sent, the address for the register is sent followed by the mask byte and then the data byte. The mask byte determines which bits in the register will be allowed to change. A ‘1’ in the mask byte will allow a bit in the register to change and a ‘0’ will not. The data byte determines what value the modified bits in the register will be changed to. A ‘1’ in the data byte will set the bit and a ‘0’ will clear the bit, provided that the mask for that bit is set to a ‘1’. (see Figure 11-1) 11.7 Reset Instruction The Reset Instruction can be used to re-initialize the internal registers of the MCP2510 and set configuration mode. This command provides the same functionality, via the SPI interface, as the RESET pin. The Reset instruction is a single byte instruction which requires selecting the device by pulling CS low, sending the instruction byte, and then raising CS. It is highly recom- mended that the reset command be sent (or the RESET pin be lowered) as part of the power-on initial- ization sequence. The MCP2510 will be held in reset for 128 FOSC cycles. |
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