xmega a3u - Elfa
xmega a3u - Elfa
xmega a3u - Elfa
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XMEGA A3U<br />
36.14.6 External clock characteristics<br />
Figure 36-3.<br />
External clock drive waveform<br />
t CH<br />
t CL<br />
t CK<br />
t CH<br />
V IL1<br />
V IH1<br />
t CR t CF<br />
Table 36-27.<br />
External clock used as system clock without prescaling.<br />
Symbo<br />
l Parameter Condition Min. Typ. Max. Units<br />
1/t CK Clock Frequency (1) V CC = 2.7 - 3.6V 0 32<br />
V CC = 1.6 - 1.8V 0 12<br />
MHz<br />
t CK<br />
t CH<br />
t CL<br />
t CR<br />
t CF<br />
Clock Period<br />
Clock High Time<br />
Clock Low Time<br />
Rise Time (for maximum frequency)<br />
Fall Time (for maximum frequency)<br />
V CC = 1.6 - 1.8V 83.3<br />
V CC = 2.7 - 3.6V 31.5<br />
V CC = 1.6 - 1.8V 30.0<br />
V CC = 2.7 - 3.6V 12.5<br />
V CC = 1.6 - 1.8V 30.0<br />
V CC = 2.7 - 3.6V 12.5<br />
V CC = 1.6 - 1.8V 10<br />
V CC = 2.7 - 3.6V 3<br />
V CC = 1.6 - 1.8V 10<br />
V CC = 2.7 - 3.6V 3<br />
Δt CK Change in period from one clock cycle to the next 10 %<br />
Note: 1. The maximum frequency vs. supply voltage is linear between 1.8V and 2.7V, and the same applies for all other parameters<br />
with supply voltage conditions.<br />
ns<br />
Table 36-28. External clock with prescaler (1) for system clock.<br />
Symbol Parameter Condition Min. Typ. Max. Units<br />
V<br />
1/t CK Clock Frequency (2) CC = 1.6 - 1.8V 0 90<br />
MHz<br />
V CC = 2.7 - 3.6V 0 142<br />
8386B–AVR–12/11<br />
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