ATXMEGA128B1 Datasheet, PDF (118/138 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA B1 Microcontroller

Figure 37-59.32.768kHz internal oscillator calibration step size.
T = -40C to 85C, V_CC = 3V.
0.01
0.005
0.000
-0.005
85°C
25°C
-40°C
-0.01
-0.015
-0.02
-0.025
-0.03
-0.035
-0.04
-0.045
0
32
64
96
128
160
192
224
256
RC32KCAL[7..0]
Figure 37-60.32.768kHz internal oscillator frequency vs. calibration value.
V_CC = 3.0V, T = 25°C.
55
50
3.0 V
45
40
35
30
25
20
0 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 256
RC32KCAL[7..0]
XMEGA B1 [DATASHEET]
8330C–AVR–07/2012
118