 Contents of the improvement
The digit display part of the display unit is made to
light up by 1 digit to suppress an electric current. The lighting-up
time of 1 digit becomes 1/3 and the light falls. When little flow of the
electric current occurs, the color patches occurs to the
displaying.
Therefore, I decided to make light up
the digits at the same time. But, in case of PIC16F873, at the number of
the IO ports, it isn't possible to make all digit light up at the same
time. Therefore, I decided to make hold the display data by latch
register (74LS273).
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