Datasheet

MCP2221
DS20005292B-page 6  2015 Microchip Technology Inc.
1.4.2 CHIP SETTINGS MAP
The Chip Settings area resides in Flash memory and is
copied into SRAM at run time. Not all of the device’s
settings can be altered at run time. 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