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MCP23009TESS 数据表(PDF) 24 Page - Microchip Technology |
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MCP23009TESS 数据表(HTML) 24 Page - Microchip Technology |
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24 / 50 page  MCP23009/MCP23S09 DS22121B-page 24 © 2009 Microchip Technology Inc. 1.6.9 INTERRUPT CAPTURE REGISTER The INTCAP register captures the GPIO port value at the time the interrupt occurred. The register is ‘read only’ and is updated only when an interrupt occurs. The register will remain unchanged until the interrupt is cleared via a read of INTCAP or GPIO. REGISTER 1-9: INTCAP – INTERRUPT CAPTURED VALUE FOR PORT REGISTER R-x R-x R-x R-x R-x R-x R-x R-x ICP7 ICP6 ICP5 ICP4 ICP3 ICP2 ICP1 ICP0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-0 ICP7:ICP0: Reflects the logic level on the port pins at the time of interrupt due to pin change <7:0>. 1 =Logic-high 0 = Logic-low |
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