Typical embedded control applications place demands
such as low power consumption, small size, low cost
and reduced component count onto the microcontroller.
This application note implements a 24-hour digital
clock, alarm and 99 minute 59 second count down
timer, yet operates on two “AA” batteries. The
PIC16C54A is perfect for this application, due to it’s
small size, high current I/Os with direct LED drive, low
cost, fast instruction throughput and low frequency/cur-
rent operation. AN615
Clock Design Using Low Power/Cost Techniques
Clock system
Author: John Day
A 32.768 kHz crystal was chosen for the clock due to
Sr., Field Application Engineer, Boston
the low power and cost requirements of this design. The
four internal phases of this input clock create an inter-
INTRODUCTION nal instruction cycle. Therefore, the instruction time is
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