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On this page, I will introduce the PIC controled circuit which is the heart of Ultra High Accuracy Digital Clock.
For the details of the clock, refer to "Ultra High Accuracy Digital Clock version 2".
As for PIC, PIC16F873 is used in the relation of the input-output port.
Also, to make a circuit compact, CPLD is used for the peripheral.
As for above JAVA applet, refer to "Digital clock Applet (Ver2)".