MCP2221 datasheet(30/80 Pages) MICROCHIP

30 / 80 page

MCP2221

DS20005292B-page 30

 2015 Microchip Technology Inc.

GP3 Power-Up Settings

Bits7-5:

Don’t

care

Bit 4: GPIO Output value

When GP3 is set as an output GPIO, this value will be

present at the GP3 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP3 is set for GPIO operation

GPIO Input mode

GPIO Output mode

Bit 2-0: GP1 Designation

111-100 Don’t care

011

Alternate function 1 (DAC2)

010

Alternate function 0 (ADC3)

001

Dedicated function operation (LED I2C)

000

GPIO operation

8-63

Don’t

care

TABLE 3-7:

RESPONSE STRUCTURE – READ USB MANUFACTURER DESCRIPTOR STRING

SUB-COMMAND

Byte Index

Value

Effect

0xB0 Read Flash Data – command code echo

0x00 Command completed successfully

(2)

Number of bytes + 2 in the provided USB Manufacturer

Descriptor String. The actual String starts at Byte Index 4.

0x03 The value at this index must always be 0x03.

4 + 2 x Unicode_char_number + 0(1)

Lower byte of the 16-bit Unicode character.

4 + 2 x Unicode_char_number + 1(1)

Higher byte of the 16-bit Unicode character.

(4 + 2 x Unicode_char_number + 2) - 63(1)

Don’t care. Only if the USB string descriptor is less than 60-bytes

long in total.

Note 1:

“Unicode_char_number” value starts from 0 to a maximum of 30 (included).

The value at Byte Index 2 must be 2 + 2 x (number of Unicode characters in the string).

TABLE 3-8:

RESPONSE STRUCTURE – READ USB PRODUCT DESCRIPTOR STRING

SUB-COMMAND

Byte Index

Value

Effect

0xB0

Read Flash Data – command code echo

0x00

Command completed successfully

(2)

Number of bytes + 2 in the provided USB Product Descriptor

String. The actual String starts at Byte Index 4.

0x03

The value at this index must always be 0x03

4 + 2 x Unicode_char_number + 0(1)

Lower byte of the 16-bit Unicode character.

4 + 2 x Unicode_char_number + 1(1)

Higher byte of the 16-bit Unicode character.

(4 + 2 x Unicode_char_number + 2) - 63(1)

Don’t care. Only if the USB string descriptor is less than

60-bytes long (in total).

Note 1:

“Unicode_char_number” value starts from 0 to a maximum of 30 (included).

The value at Byte Index 2 must be 2 + 2 x (number of Unicode characters in the string).

TABLE 3-6:

RESPONSE STRUCTURE – READ GP SETTINGS SUB-COMMAND (CONTINUED)

Byte

Index

Function Description

Value

Effect

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