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MCP23S17T-E/SP Datasheet(PDF) 6 Page - Microchip Technology |
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MCP23S17T-E/SP Datasheet(HTML) 6 Page - Microchip Technology |
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6 / 48 page  MCP23017/MCP23S17 DS21952B-page 6 © 2007 Microchip Technology Inc. 1.3.2.2 I2C Read Operation I2C Read operations include the control byte sequence, as shown in the bottom of Figure 1-1. This sequence is followed by another control byte (including the Start condition and ACK) with the R/W bit set (R/W = 1). The MCP23017 then transmits the data contained in the addressed register. The sequence is ended with the master generating a Stop or Restart condition. 1.3.2.3 I2C Sequential Write/Read For sequential operations (Write or Read), instead of transmitting a Stop or Restart condition after the data transfer, the master clocks the next byte pointed to by the address pointer (see Section 1.3.1 “Byte Mode and Sequential Mode” for details regarding sequential operation control). The sequence ends with the master sending a Stop or Restart condition. The MCP23017 Address Pointer will roll over to address zero after reaching the last register address. Refer to Figure 1-1. 1.3.3 SPI INTERFACE 1.3.3.1 SPI Write Operation The SPI write operation is started by lowering CS. The Write command (slave address with R/W bit cleared) is then clocked into the device. The opcode is followed by an address and at least one data byte. 1.3.3.2 SPI Read Operation The SPI read operation is started by lowering CS. The SPI read command (slave address with R/W bit set) is then clocked into the device. The opcode is followed by an address, with at least one data byte being clocked out of the device. 1.3.3.3 SPI Sequential Write/Read For sequential operations, instead of deselecting the device by raising CS, the master clocks the next byte pointed to by the Address Pointer. (see Section 1.3.1 “Byte Mode and Sequential Mode” for details regarding sequential operation control). The sequence ends by the raising of CS. The MCP23S17 Address Pointer will roll over to address zero after reaching the last register address. |
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