MCP2221 datasheet(37/80 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005292B-page 37

MCP2221

3.1.3.1

Responses

TABLE 3-16:

SUB-COMMAND STRUCTURE – WRITE USB SERIAL NUMBER DESCRIPTOR

STRING SUB-COMMAND

Byte Index

Value

Effect

0xB1

Write Flash Data – command code

0x04

Write USB Serial Number Descriptor String – writes the USB Serial

Number String Descriptor used during the USB enumeration

(2)

Number of bytes + 2 in the provided USB Serial Number 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

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 3-17:

RESPONSE STRUCTURE – READ CHIP FACTORY SERIAL NUMBER

SUB-COMMAND

Byte

Index

Value

Effect

0xB1

Write Flash Data – command code

0x00

Command completed successfully

0x02

Command not supported

0x03

Command not allowed

2-63

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