
At 5:00 MHz : Count read by processor ¼
10 MHz
500 Hz
¼ 20; 000
At 5:005 MHz : Count read by processor ¼
10 MHz
500:5Hz
¼ 19; 980
These results amount to a 20-count difference. This approach requires more
hardware and a higher frequency sampling clock. The sampling rate is not fixed,
but is dependent on the input frequency. However, this approach allows higher
resolution without changing the sampling interval. More resolution is obtainable
simply by increasing the sampling clock. In this case, going from 10 MHz to
20 MHz would double the number of counts for the same frequency change
without changing the sample interval. Of course, you would need a large ...