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I want to ask you a question about using Timer as a counter for external events ..
Does the counter increases if the feeding signals is a high to low pulse ? ,or it must be a low to high pulses ?
I am currently using 89C51
Hi osama,
Yes. If you are using Timer as a counter, it starts counting external events as the pulses it gets through its corresponding input pin. You can count the pulses.
Yeah but in my circuit i am using a 555 timer ,and the output of the 555 timer is a high to low pulse , and I want to count these pulses ,but I am not sure if the 8051 counter increase with high to low pulses ,
counter can increase on any edge transition. if you want low to high transition from IC555 use transistor at the output
you can give trigger to counter directly by IC555. if your counter does not count then there is a problem in your program. or in your hardware circuit
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