27220 Parallax Inc, 27220 Datasheet - Page 117
27220
Manufacturer Part Number
27220
Description
BOOK STAMPWORKS
Manufacturer
Parallax Inc
Datasheet
1.27220.pdf
(230 pages)
Specifications of 27220
Accessory Type
Booklet
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Not applicable / Not applicable
For Use With/related Products
StampWorks
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Not applicable / Not applicable
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' -----[ Initialization ]--------------------------------------------------
Reset:
' -----[ Program Code ]----------------------------------------------------
Main:
Behind the Scenes
In the last experiment, we learned that the frequency of a signal is defined as the
number of cycles per second. We created a simple frequency meter by counting the
number of pulses (cycles) in one second. This method works well, especially for low-
frequency signals. There will be times, however, when project requirements will
dictate a quicker response time for frequency measurement.
The frequency of a signal can be calculated from its period, or the time for one
complete cycle as shown in the illustration below:
By measuring the period of an incoming signal, its frequency can be calculated with
the equation (where the period is expressed in seconds):
DEBUG CLS,
DO
LOOP
PULSIN FreqIn, 0, pLow
PULSIN FreqIn, 1, pHigh
period = (pLow + pHigh) */ Scale
freq = 62500 / period * 16
DEBUG CRSRXY, 15, 0, DEC period, CLREOL,
Frequency = 1 / Period
"Period.(uS)... ", CR,
"Freq (Hz)..... "
CRSRXY, 15, 1, DEC freq, CLREOL
' setup report output
' get high side of input
' get low side of input
' scale to uSecs
' calculate frequency
' display values
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