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MCP23S08 Datasheet(PDF) 8 Page - Microchip Technology |
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MCP23S08 Datasheet(HTML) 8 Page - Microchip Technology |
8 / 44 page MCP23008/MCP23S08 DS21919D-page 8 © 2007 Microchip Technology Inc. 1.4.1 ADDRESSING I2C DEVICES (MCP23008) The MCP23008 is a slave I2C 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 (MCP23S08) The MCP23S08 is a slave SPI device. The slave address contains five fixed bits and two user-defined hardware address bits (pins A1 and A0), with the read/ write bit filling out the control byte. Figure 1-3 shows the control byte format. 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 1000 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 A7A6A5A4 A3A2A1A0 ACK Device Opcode Register Address R/W = 0 The ACKs are provided by the MCP23008. 0100 0 A1 A0 R/W A7 A6 A5 A4 A3 A2 A1 A0 Device Opcode Register Address CS |
Número de pieza similar - MCP23S08 |
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Descripción similar - MCP23S08 |
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