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MCP23S17T-E/SP Datasheet(PDF) 8 Page - Microchip Technology |
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MCP23S17T-E/SP Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 48 page  MCP23017/MCP23S17 DS21952B-page 8 © 2007 Microchip Technology Inc. 1.4 Hardware Address Decoder The hardware address pins are used to determine the device address. To address a device, the correspond- ing address bits in the control byte must match the pin state. The pins must be biased externally. 1.4.1 ADDRESSING I2C DEVICES (MCP23017) The MCP23017 is a slave I2C interface device that supports 7-bit slave addressing, with the read/write bit filling out the control byte. The slave address contains four fixed bits and three user-defined hardware address bits (pins A2, A1 and A0). Figure 1-2 shows the control byte format. 1.4.2 ADDRESSING SPI DEVICES (MCP23S17) The MCP23S17 is a slave SPI device. The slave address contains four fixed bits and three user-defined hardware address bits (if enabled via IOCON.HAEN) (pins A2, A1 and A0) with the read/write bit filling out the control byte. Figure 1-3 shows the control byte format. The address pins should be externally biased even if disabled (IOCON.HAEN = 0). FIGURE 1-2: I2C™ CONTROL BYTE FORMAT FIGURE 1-3: SPI CONTROL BYTE FORMAT FIGURE 1-4: I2C™ ADDRESSING REGISTERS FIGURE 1-5: SPI ADDRESSING REGISTERS S 0 1 0 0 A2A1A0 R/W ACK Start bit Slave Address R/W bit ACK bit Control Byte R/W = 0 = write R/W = 1 = read 0 1 0 0 A2 A1 A0 R/W Slave Address R/W bit Control Byte R/W = 0 = write R/W = 1 = read CS S0 1 0 0 A2 A1 A0 0 ACK* A7 A6 A5 A4 A3 A2 A1 A0 ACK* Device Opcode Register Address R/W = 0 *The ACKs are provided by the MCP23017. 0 100 A2 * A1 * A0 * R/W A7 A6A5A4A3A2A1A0 Device Opcode Register Address CS * Address pins are enabled/disabled via IOCON.HAEN. |
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