Datasheet

MCP2221
DS20005292A-page 38  2014 Microchip Technology Inc.
3.1.4 SEND FLASH ACCESS PASSWORD
This command is used to send a user-supplied pass-
word that will be compared with the one stored in the
device’s Flash when Flash updates (Chip/GP configu-
ration, USB strings) are required and the Flash data is
password-protected.
In the case where no protection mechanism is in place,
or the Flash data has been permanently locked, this
command has no meaning.
3.1.4.1 Responses
TABLE 3-18: COMMAND STRUCTURE
Byte
Index
Value Effect
0 0xB2 Send Flash Access Password – command code
1Don’t
care
2 Password byte 1
3 Password byte 2
4 Password byte 3
5 Password byte 4
6 Password byte 5
7 Password byte 6
8 Password byte 7
9 Password byte 8
10-63 Don’t care
TABLE 3-19: RESPONSE 1 STRUCTURE
Byte
Index
Value Effect
0 0xB2 Send Flash Access Password – command code echo
1 0x00 Command completed
successfully.
0x03 Command not allowed (when the number of failed Flash updates has been reached, no password
will be accepted).
2-63 Don’t
care