- Name:
- pulsin
- Syntax:
-
PULSIN pin, state, wordvariable
Pin - is a variable/constant which specifies the i/o pin to use.
State - is a variable/constant (0 or 1) which specifies which edge must occur before beginning the measurement in 10us units (at 4MHz resonator).
Wordvariable - receives the result (1-65535). If timeout occurs (0.65536s at 4MHz) the result will be 0.
- Description:
-
Measure the length of an input pulse.
The pulsin command makes a pin an input and then measures the length of a pulse on that pin. If no pulse occurs in the timeout period, the result will be 0. If state = 1 then a low to high transition starts the timing, if state = 0 a high to low transition starts the timing. Use the count command to count the number of pulses with a specified time period.
It is normal to use a word variable with this command.
Effect of Increased Clock Speed:
4MHz 10us unit 0.65536s timeout 8MHz 5us unit 0.32768s timeout 16MHz 2.5us unit 0.16384s timeout 32MHz 1.25us unit 0.08192s timeout 64MHz 0.625us unit 0.04096s timeout
- Applies To:
- All
- See Also:
- Related Create:
- Share:
-
- Print:
-
Meaure the length of a pulse
Measure the length of a pulse on C.3 and report its length
- Code Example:
-
main: pulsin C.3,1,w1 ; record the length of a pulse on C.3 into w1 debug ; report the result goto main ; and repeat
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