92
7598H–AVR–07/09
ATtiny25/45/85
Resolution shows how many bit is required to express the value in the OCR1C register. It is cal-
culated by following equation
Resolution
PWM
= log
2
(OCR1C + 1).
Table 14-6. Timer/Counter1 Clock Prescale Select in the Asynchronous Mode
PWM Frequency Clock Selection CS13..CS10 OCR1C RESOLUTION
20 kHz PCK/16 0101 199 7.6
30 kHz PCK/16 0101 132 7.1
40 kHz PCK/8 0100 199 7.6
50 kHz PCK/8 0100 159 7.3
60 kHz PCK/8 0100 132 7.1
70 kHz PCK/4 0011 228 7.8
80 kHz PCK/4 0011 199 7.6
90 kHz PCK/4 0011 177 7.5
100 kHz PCK/4 0011 159 7.3
110 kHz PCK/4 0011 144 7.2
120 kHz PCK/4 0011 132 7.1
130 kHz PCK/2 0010 245 7.9
140 kHz PCK/2 0010 228 7.8
150 kHz PCK/2 0010 212 7.7
160 kHz PCK/2 0010 199 7.6
170 kHz PCK/2 0010 187 7.6
180 kHz PCK/2 0010 177 7.5
190 kHz PCK/2 0010 167 7.4
200 kHz PCK/2 0010 159 7.3
250 kHz PCK 0001 255 8.0
300 kHz PCK 0001 212 7.7
350 kHz PCK 0001 182 7.5
400 kHz PCK 0001 159 7.3
450 kHz PCK 0001 141 7.1
500 kHz PCK 0001 127 7.0
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