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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP23008-E/ML датащи(PDF) 13 Page - Microchip Technology |
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MCP23008-E/ML датащи(HTML) 13 Page - Microchip Technology |
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13 / 44 page  © 2007 Microchip Technology Inc. DS21919D-page 13 MCP23008/MCP23S08 1.6.4 DEFAULT COMPARE (DEFVAL) REGISTER FOR INTERRUPT-ON- CHANGE The default comparison value is configured in the DEFVAL register. If enabled (via GPINTEN and INTCON) to compare against the DEFVAL register, an opposite value on the associated pin will cause an interrupt to occur. REGISTER 1-4: DEFVAL – DEFAULT VALUE REGISTER (ADDR 0x03) R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 DEF7 DEF6 DEF5 DEF4 DEF3 DEF2 DEF1 DEF0 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 DEF7:DEF0: These bits set the compare value for pins configured for interrupt-on-change from defaults <7:0>. Refer to INTCON. If the associated pin level is the opposite from the register bit, an interrupt occurs. Refer to INTCON and GPINTEN. |
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