MCP2221 datasheet(32/80 Pages) MICROCHIP

32 / 80 page

MCP2221

DS20005292B-page 32

 2015 Microchip Technology Inc.

3.1.3

WRITE FLASH DATA

This command is used to write various important data

structures and strings into the Flash memory of the

device.

TABLE 3-11:

COMMAND STRUCTURE

Byte

Index

Function Description

Value

Effect

0xB1

Write Flash Data – command code

Write Flash Data Sub-code. The value in

this field will instruct the MCP2221 about

the particular Flash settings to be altered.

0x00

Write Chip Settings – it will write the MCP2221 flash

settings

0x01

Write GP Settings – it will write the MCP2221 flash GP

settings

0x02

Write USB Manufacturer Descriptor String – writes the

USB Manufacturer String Descriptor used during the

USB enumeration

0x03

Write USB Product Descriptor String – writes the USB

Product String Descriptor used during the USB

enumeration

0x04

Write USB Serial Number Descriptor String – writes the

USB Serial Number String Descriptor used during the

USB enumeration

Any

other

value

No meaning. The device will reply with a code for an

unsupported command at Byte Index 1 in the response

report.

2-63 Data to be written

Data format depends on the Write Flash Data Sub-code

(at Byte Index 1).

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