MCP2221 datasheet(35/80 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005292B-page 35

MCP2221

TABLE 3-13:

SUB-COMMAND STRUCTURE – WRITE GP SETTINGS SUB-COMMAND

Byte

Index

Function Description

Value

Effect

0xB1

Write Flash Data – command code

0x01

Write GP Settings – it will write the MCP2221 flash GP

settings

GP0 Power-Up Settings

Bit 7-5:

Don’t care

Bit 4: GPIO Output value

When GP0 is set as an output GPIO, this value will be

present at the GP0 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP0 is set for GPIO operation.

GPIO Input mode

GPIO Output mode

Bit 2-0: GP0 Designation

111-011

Don’t care

010

Dedicated function operation (SSPND)

001

Alternate function 0 (LED UART RX)

000

GPIO operation

GP1 Power-Up Settings

Bit 7-5:

Don’t care

Bit 4: GPIO Output value

When GP1 is set as an output GPIO, this value will be

present at the GP1 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP1 is set for GPIO operation.

GPIO Input mode

GPIO Output mode

Bit 2-0: GP1 Designation

111-101

Don’t care

100

Alternate function 2 (Interrupt Detection)

011

Alternate function1 (LED UART TX)

010

Alternate function 0 (ADC1)

001

Dedicated function operation (Clock Output)

000

GPIO operation

GP2 Power-Up Settings

Bit 7-5:

Don’t care

Bit 4: GPIO Output value

When GP2 is set as an output GPIO, this value will be

present at the GP2 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP2 is set for GPIO operation.

GPIO Input mode

GPIO Output mode

Bit 2-0: GP2 Designation

111-100

Don’t care

011

Alternate function1 (DAC1)

010

Alternate function 0 (ADC2)

001

Dedicated function operation (Clock Output)

000

GPIO operation

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