Datasheet

 2014 Microchip Technology Inc. DS20005292A-page 7
MCP2221
REGISTER 1-1: CHIPSETTING0 REGISTER
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
CDCSNEN LEDURX-
INST
LEDUTX-
INST
LEDI2CINS
T
SSPNDINS
T
USBCF-
GINST
CHIPPROT1 CHIPPROT0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7 CDCSNEN: USB CDC Serial Number Enable
1 = USB CDC Serial Number is enumerated
0 = No USB CDC Serial Number enumeration (factory default)
bit 6 LEDURXINST: LED UART R
X Inactive State
1 =LED UART R
X is inactive high and active low (factory default)
0 =LED UART R
X is inactive low and active high
bit 5 LEDUTXINST: LED UART TX Inactive State
1 = LED UART Tx is inactive high and active low (factory default)
0 =LED UART T
X is inactive low and active high
bit 4 LEDI2CINST: LED I
2
C Inactive State
1 =LED I
2
C is inactive high and active low (factory default)
0 =LED I
2
C is inactive low and active high
bit 3 SSPNDINST: SSPND Inactive State
1 = SSPND is inactive high and active low (factory default)
0 = SSPND is inactive low and active high
bit 2 USBCFGINST: USBCFG Inactive State
1 = USBCFG is inactive high and active low (factory default)
0 = USBCFG is inactive low and active high
bit 1-0 CHIPPROT<1:0>: Chip Settings Protection Level
11 =Reserved
10 = Permanently locked
01 = Password protection
00 = Chip settings unprotected (factory default)