MCP2221 datasheet(12/80 Pages) MICROCHIP

12 / 80 page

MCP2221

DS20005292B-page 12

 2015 Microchip Technology Inc.

1.4.3

GP SETTINGS MAP

The GP Settings area resides in Flash memory and is

copied into SRAM at run time. The user can alter both

the Flash and the SRAM GP settings. Any modification

in the SRAM copy of the GP settings will have an

immediate effect. The GP pins designation changes

according to the new content of the SRAM settings.

The Flash variant of the settings will affect the

Power-Up behavior of the GP pins.

TABLE 1-4:

GP SETTINGS MAP

Byte

Index

Name

Comments

GPSETTING0 GP0 pin designation and GPIO default output value, when GP is set for GPIO output operation

GPSETTING1 GP1 pin designation and GPIO default output value, when GP is set for GPIO output operation

GPSETTING2 GP2 pin designation and GPIO default output value, when GP is set for GPIO output operation

GPSETTING3 GP3 pin designation and GPIO default output value, when GP is set for GPIO output operation

GPSETTING0 REGISTER

R/W-0

R/W-1

R/W-0

R/W-1

R/W-0

—

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 GP0 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 GP0 is set for GPIO operation)

1 = GPIO Input

0 = GPIO Output (factory default)

bit 2-0

GPDES<2:0>: GP0 Designation

111 = Reserved

110 = Reserved

101 = Reserved

100 = Reserved

011 = Reserved

010 = Alternate function 0 (LED UART RX – LEDURX) (factory default)

001 = Dedicated function operation (SSPND)

000 = GPIO operation (GPIO0)

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