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ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller CBGA 100 (9x9) 8/16-Bit 32 MHz I/O number 53
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XMEGA B [DATASHEET]
8291B–AVR–01/2013
4.16.17 USBCAL0 – USB Calibration register 0
USBCAL0 and USBCAL1 contain the calibration value for the USB pins. Calibration is done during production to enable
operation without requiring external components on the USB lines for the device. The calibration bytes are not loaded
automatically into the USB calibration registers, and so this must be done from software.
Bit 7:0 – USBCAL0[7:0]: USB Pad Calibration Byte 0
This byte contains byte 0 of the USB pin calibration data, and must be loaded into the USB CALL register.
4.16.18 USBCAL1 – USB Pad Calibration register 1
Bit 7:0 – USBCAL1[7:0]: USB Pad Calibration Byte 1
This byte contains byte 1 of the USB pin calibration data, and must be loaded into the USB CALH register.
4.16.19 RCOSC48M – USB RCOSC Calibration
Bit 7:0 – RCOSC48M[7:0]: 48MHz RSCOSC Calibration
This byte contains a 48MHz calibration value for the internal 32MHz oscillator. When this calibration value is written to
calibration register B for the 32MHz DFLL, the oscillator is calibrated to 48MHz to enable full-speed USB operation from
internal oscillator.
Note: The COMP2 and COMP1 registers inside the DFLL32M must be set to B71B.
4.16.20 ADCACAL0 – ADCA Calibration register 0
ADCACAL0 and ADCACAL1 contain the calibration value for the analog-to-digital converter A (ADCA). Calibration is
done during production testing of the device. The calibration bytes are not loaded automatically into the ADC calibration
registers, and so this must be done from software.
Bit 7:0 – ADCACAL0[7:0]: ADCA Calibration Byte 0
This byte contains byte 0 of the ADCA calibration data, and must be loaded into the ADCA CALL register.
Bit 7 6 5 4 3 2 1 0
+0x1A USBCAL0[7:0]
Read/Write R R R R R R R R
Initial Value x x x x x x x x
Bit 7 6 5 4 3 2 1 0
+0x1B USBCAL1[7:0]
Read/Write R R R R R R R R
Initial Value x x x x x x x x
Bit 7 6 5 4 3 2 1 0
+0x1C RCOSC48M[7:0]
Read/Write R R R R R R R R
Initial Value x x x x x x x x
Bit 7 6 5 4 3 2 1 0
+0x20 ADCACAL0[7:0]
Read/Write R R R R R R R R
Initial Value x x x x x x x x