MCP2221 datasheet(50/80 Pages) MICROCHIP

50 / 80 page

MCP2221

DS20005292B-page 50

 2015 Microchip Technology Inc.

ADC Voltage Reference – this allows the user to modify the ADC reference voltage

Bit 7: Enable loading of a

new ADC reference

Bits 2-0 will be used for ADC reference voltage selection

ADC reference will remain unaltered

Bit 6-3

Don’t

care

Bit 2-1: These bits are

used to change the DAC

VRM voltage

VRM voltage is 4.096V (only if VDD is higher than this value)

VRM voltage is 2.048V

VRM voltage is 1.024V

VRM voltage is off

Bit 0: This bit is used to

change the DAC

reference voltage

VDD ADC voltage reference is the internal ADC voltage reference

module (ADC VRM)

ADC voltage reference is VDD

Setup the interrupt detection mechanism and clear the detection flag – useful for preparing the interrupt

detection module to detect a new interrupt condition

Bit 7: Enable the

modification of the

interrupt detection

conditions

The interrupt detection settings and flag will change

The interrupt detection settings and flag will remain unchanged

Bit 6-5

Don’t

care

Bit 4

Enable the modification of the positive edge detection

Bit 3: The new value for

the positive edge

detector

Interrupt detection will trigger on positive edges

Interrupt detection will not trigger on positive edges

Bit 2

Enable the modification of the negative edge detection

Bit 1: The new value for

the negative edge

detector

Interrupt detection will trigger on negative edges

Interrupt detection will not trigger on negative edges

Bit 0: Clear the interrupt

detection flag

Clear the interrupt detection flag

Leave the interrupt detection flag as is

Alter GPIO configuration:

alters the current GP

designation

Alter the GP designation. The values from Byte Index 8 will be used to

load a new set of values into the SRAM GP settings.

Do not alter the current GP designation

GP0 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

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

Alternate function 0 (LED UART RX)

001

Dedicated function operation (SSPND)

000

GPIO operation

TABLE 3-36:

COMMAND STRUCTURE (CONTINUED)

Byte

Index

Function Description

Value

Effect

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