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 CONPROSYS Script sample programs  No. 008
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Process name: Anti-chattering Circuit
Date of creation: February 22, 2016
Processing content:
Anti-chattering ciucuits of DI0 to DI3 digital inputs.
A 4-digit up / down counter is used as an application example.

[Signals]
DI0 to DI3 - The digital inputs that are applied an anti-chattering function respectively by software.

* Meanings of reference circuit signals
DI0 - Count up signal
DI1 - Count down signal

DO0 to DO3 - numeric part of 7-segment display
DO4 to DO7 - strobe part of 7-segment display


[Operation]
1. Process the input signals of DI 0 to DI 3 separately by delay processing and set them to the lower 4 bits of TAG 10.

2. As an application example, a 4-digit counter circuit is created. The DI0 is used as a count up input and the DI1 is used as a count down input.

[Description]
This sample program has the following tasks.

<TASK7> A 4-digit up / down counter. The count value is stored in TAG90.

<SUB9>  A strobe type 7-segment display (four digits) driven subroutine.

<TASK8> Anti-chattering function. The off delayed results of DI0 to DI3 are set to TAG10.

<TASK9> 10 msec measurement process.
        It is a 10 msec measurement process to accurately measure off delay time as much as possible.
        Every 10 msec, set the value of TAG19 to one.