Datasheet

MCP2221
DS20005292A-page 6  2014 Microchip Technology Inc.
1.4.2 CHIP SETTINGS MAP
The Chip Settings area resides in Flash memory and is
copied into SRAM at runtime. Not all of the device’s set-
tings can be altered at runtime. All the fields in the
Flash settings can be altered by the user.
TABLE 1-3: CHIP SETTINGS MAP
Byte
Index
Register Name Comments
0 CHIPSETTING0 Controls the USB CDC serial number enumeration, default state for the GP LED
designation, default state for GP dedicated-function pins and chip settings
protection level
1 CHIPSETTING1 Default clock output divider and duty cycle
2 CHIPSETTING2 DAC reference options and default DAC value
3 CHIPSETTING3 ADC reference and interrupt detection settings
4 USBVIDL USB VID lower byte
5 USBVIDH USB VID higher byte
6 USBPIDL USB PID lower value
7 USBPIDH USB PID higher byte
8 USBPWRATTR USB power attributes
9 USBREQCRT USB required current
10 PASS0 Password byte 0
11 PASS1 Password byte 1
12 PASS2 Password byte 2
13 PASS3 Password byte 3
14 PASS4 Password byte 4
15 PASS5 Password byte 5
16 PASS6 Password byte 6
17 PASS7 Password byte 7