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[avr-chat] ATmega 128 Fast PWM Problem
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From: |
Thomas D. Dean |
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Subject: |
[avr-chat] ATmega 128 Fast PWM Problem |
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Date: |
Fri, 08 Feb 2013 17:28:06 -0800 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0 |
I have noticed a strange behavior with fast PWM.
ATmega128.
WGM mode 5
COM1A[1:0]=2
clk/8
The waveform on B[5] behaves normal for all values I have checked,
except for OCR1A=127!
With OCR1A=124, I see a waveform high for 63 usec, period of 126 usec.
With OCR1A=127, I see a waveform high for 3.1`usec, period of 126 usec.
With OCR1A=130, I see a waveform high for 68 usec, perios of 126 usec.
I cannot find an explanation in the datasheet.
What am I missing?
Tom Dean
- [avr-chat] ATmega 128 Fast PWM Problem,
Thomas D. Dean <=