Datasheet

 2015 Microchip Technology Inc. DS20005292B-page 13

MCP2221

R/W-0 R/W-0 R/W-0 R/W-1 R/W-0 R/W-0 R/W-1 R/W-1

— — — GPIOOUTVAL GPIODIR GPDES2 GPDES1 GPDES0

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 7-5 Reserved: Set to ‘0’

bit 4 GPIOOUTVAL: GPIO Output Value (valid only when GP1 is set for GPIO output operation)

1 = Default output value is logic ‘1’ (factory default)

0 = Default output value is logic ‘0’

bit 3 GPIODIR: GPIO Direction (input or output; valid only when GP1 is set for GPIO operation)

1 = GPIO Input

0 = GPIO Output (factory default)

bit 2-0 GPDES<2:0>: GP1 Designation

111 = Reserved

110 = Reserved

101 = Reserved

100 = Alternate function 2 (Interrupt detector)

011 = Alternate function 1 (LED UART T

X – LEDUTX) (factory default)

010 = Alternate function 0 (ADC1)

001 = Dedicated function operation (Clock Output)

000 = GPIO operation (GPIO1)