Datasheet

109
XMEGA A1U [DATASHEET]
Atmel-8385H-AVR-ATxmega64A1U-128A1U-Datasheet–AVR–04/2014
37.2.14.3 Calibrated and tunable 32MHz internal oscillator characteristics
Table 37-57. 32MHz internal oscillator characteristics.
37.2.14.4 32kHz Internal ULP Oscillator characteristics
Table 37-58. 32kHz internal ULP oscillator characteristics.
37.2.14.5 Internal Phase Locked Loop (PLL) characteristics
Table 37-59. Internal PLL characteristics.
Note: 1. The maximum output frequency vs. supply voltage is linear between 1.8V and 2.7V, and can never be higher than four times the maximum CPU frequency.
Symbol Parameter Condition Min. Typ. Max. Units
Tunable frequency range
DFLL can tune to this frequency over
voltage and temperature
30 35
MHz
Factory calibrated frequency 32
Factory calibration accuracy T = 85C, V
CC
= 3.0V -1.5 1.5
%
DFLL calibration step size 0.24
Symbol Parameter Condition Min. Typ. Max. Units
Output frequency 32 kHz
Accuracy -30 30 %
Symbol Parameter Condition Min. Typ. Max. Units
f
IN
Input frequency Output frequency must be within f
OUT
0.4 64
MHz
f
OUT
Output frequency
(1)
V
CC
= 1.6 20 32
V
CC
= 2.7 20 96
V
CC
= 3.6V 20 128
Duty cycle 50 %
Start-up lock time f
OUT
= 48MHz 18
µs
Re-lock time f
OUT-init
= 10MHz, f
OUT-end
= 64MHz 17