4-digit Up/Down counter with PIC 16F88


Posted on Jul 11, 2012

This is a 4 digit decimal counter which can operate as a free running counter or in count and hold mode with manual reset. In either mode the counter can be preset to count to a specified value. Clock edge and leading zero suppression can also be configured. The 7-segment display and indicator LEDs are multiplexed. It will drive most common anode 7 segment LEDs. I used four single digit LEDs but a four digit LED module could also be used. In free running mode the overflow output resets on the next clock pulse. Therefore the pulse duration is directly related to the input clock frequency.



The clock input goes to a Schmitt trigger input pin on the PIC. It will accept a 0-5V input signal only. If it's used with a mechanical switch you should use the debounce circuit shown on the schematic. I've had the circuit clock reliably at 200Hz an




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