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MCP23008-E/P bảng dữ liệu(PDF) 7 Page - Microchip Technology |
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MCP23008-E/P bảng dữ liệu(HTML) 7 Page - Microchip Technology |
7 / 44 page © 2007 Microchip Technology Inc. DS21919D-page 7 MCP23008/MCP23S08 FIGURE 1-1: MCP23008 I2C™ DEVICE PROTOCOL 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. The sequence ends by the raising of CS. The MCP23S08 address pointer will roll over to address zero after reaching the last register address. 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. • MCP23008 has address pins A2, A1 and A0. • MCP23S08 has address pins A1 and A0. The pins must be biased externally. S P SR w R OP ADDR DOUT DIN - START - RESTART - STOP - Write - Read - Device opcode - Device address - Data out from MCP23008 - Data into MCP23008 S P SR W R OP ADDR DIN DIN .... S P W R OP ADDR DOUT DOUT .... P SR W OP DIN DIN .... P P SR R DOUT DOUT .... P OP DOUT DOUT .... P SR OP DIN .... P OP DIN S P W OP ADDR DIN DIN .... Byte and Sequential Write S W OP SR R OP DOUT DOUT .... P Byte and Sequential Read S W OP ADDR DIN P S W OP SR R OP DOUT P Byte Sequential Byte Sequential |
Số phần tương tự - MCP23008-E/P |
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Mô tả tương tự - MCP23008-E/P |
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