Datasheet

38.8.1.6 Pad Calibration
Name: PADCAL
Offset: 0x28
Reset: 0x0000
Property: PAC Write-Protection
The Pad Calibration values must be loaded from the NVM Software Calibration Area into the USB Pad
Calibration register by software, before enabling the USB, to achieve the specified accuracy.
Refer to NVM Software Calibration Area Mapping for further details.
Refer to for further details.
Bit 15 14 13 12 11 10 9 8
TRIM[2:0] TRANSN[4:2]
Access
R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0
Bit 7 6 5 4 3 2 1 0
TRANSN[1:0] TRANSP[4:0]
Access
R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0
Bits 14:12 – TRIM[2:0] Trim bits for DP/DM
These bits calibrate the matching of rise/fall of DP/DM.
Bits 10:6 – TRANSN[4:0] Trimmable Output Driver Impedance N
These bits calibrate the NMOS output impedance of DP/DM drivers.
Bits 4:0 – TRANSP[4:0] Trimmable Output Driver Impedance P
These bits calibrate the PMOS output impedance of DP/DM drivers.
38.8.2 Device Registers - Common
SAM D5x/E5x Family Data Sheet
USB – Universal Serial Bus
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1142