Attiny15l – Rainbow Electronics ATtiny15L User Manual
Page 33
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33
ATtiny15L
1187E–AVR–06/02
The frequency of the PWM will be Timer Clock Frequency divided by OCR1B value + 1.
The exact duty-cycle of the non-inverted PWM output is:
Where:
T
T1
is the period of the selected Timer/Counter1 Clock Source.
T
PCK
is the period of the PCK Clock (39.1 ns).
Table 14. Timer/Counter1 Clock Prescale Select
Clock Selection
OCR1B
PWM Frequency
CK
159
10 kHz
PCK/8
159
20 kHz
PCK/4
213
30 kHz
PCK/4
159
40 kHz
PCK/2
255
50 kHz
PCK/2
213
60 kHz
PCK/2
181
70 kHz
PCK/2
159
80 kHz
PCK/2
141
90 kHz
PCK
255
100 kHz
PCK
231
110 kHz
PCK
213
120 kHz
PCK
195
130 kHz
PCK
181
140 kHz
PCK
169
150 kHz
OCR1A +1
(
) T
T1
×
T
PCK
–
OCR1B +1
(
) T
T1
Ч
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