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MCP23016 Datasheet(PDF) 11 Page - Microchip Technology |
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MCP23016 Datasheet(HTML) 11 Page - Microchip Technology |
11 / 38 page © 2007 Microchip Technology Inc. DS20090C-page 11 MCP23016 1.7.6 I/O EXPANDER CONTROL REGISTER • IOCON0 controls the functionality of the MCP23016. The IARES (Interrupt Activity Resolution) bit controls the sampling frequency of the GP port pins. The higher the sampling frequency, the higher the device current requirements. If this bit is ‘0’ (default), the maximum time to detect the activity on the port is 32 ms (max.), which results in lower standby current. If this bit is ‘1’, the maximum time to detect activity on the port is 200 µsec. (max.) and results in higher standby current. REGISTER 1-11: IOCON0 - I/0 EXPANDER CONTROL REGISTER U-0 U-0 U-0 U-0 U-0 U-0 U-0 R/W-0 — — — — — — — IARES bit 7 bit 0 bit 1-7 Unimplemented bit: Read as ‘0’ bit 0 IARES : Interrupt Activity Resolution 1 = Fast sample rate 0 = Normal sample rate 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 IOCON1 is a shadow register for IOCON0. Access to IOCON1 results in access to IOCON0. |
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