Frequency counter with PIC16F628A - Electronics-Lab.com
Frequency Counter by PIC16F628 - EEWeb
Frequency counter with PIC16F628A Circuit - EasyEDA open source hardware lab
Frequency Counter( Mine Worked Up to 70MHz) Using PIC 16F628A (with Prototype PCB and Built in Crystal Oscillator) for HAM Shacks : 5 Steps - Instructables
1GHZ Frequency Meter
Frequency Meter.
Contador Digital PIC 16F628 - Digital Counter With Stop relay - YouTube
Frequency counter with PIC16F628A - Electronics-Lab.com
Saeed's Blog: PIC16F628A up down counter code + Proteus simulation
100MHz frequency counter with PIC16F628A – LED Display
DIYfan: 100MHz frequency counter
Scorpionz - Electronic Circuits and Microcontroller Projects: Seven Segment Up Counter and Timer Circuit - 16F628