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MCP2221AT-I/ML Datasheet(PDF) 26 Page - Microchip Technology |
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MCP2221AT-I/ML Datasheet(HTML) 26 Page - Microchip Technology |
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26 / 80 page  MCP2221A DS20005565A-page 26 2016 Microchip Technology Inc. 3.1.2 READ FLASH DATA This command is used to read various important data structures and strings that are stored in Flash memory on the MCP2221A. 3.1.2.1 Responses TABLE 3-3: COMMAND STRUCTURE Byte Index Function Description Value Effect 0 0xB0 Read Flash Data – command code 1 Read Flash Data Sub-code. The value in this field will instruct the MCP2221A on what Flash data to be read. 0x00 Read Chip Settings – it will read the MCP2221A Flash settings 0x01 Read GP Settings – it will read the MCP2221A Flash GP settings 0x02 Read USB Manufacturer Descriptor String – reads the USB Manufacturer String Descriptor used during the USB enumeration 0x03 Read USB Product Descriptor String – reads the USB Product String Descriptor used during the USB enumeration 0x04 Read USB Serial Number Descriptor String – reads the USB Serial Number String Descriptor that is used during USB enumeration. This serial number can be changed by the user through a specific USB HID command. 0x05 Read Chip Factory Serial Number – reads the factory-set serial number. This serial number cannot be changed. 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 Reserved 0x00 TABLE 3-4: RESPONSE STRUCTURE Byte Index Function Description Value Effect 0 0xB0 Read Flash Data – command code 1 0x00 Command completed successfully 0x01 Command not supported 2 Data structure length or Don’t care 3-63 Data or Don’t care Depends on the issued sub-command or the returned code at Byte Index 1 |
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