Implementing Wake-up on Key Stroke

Posted on Jun 15, 2012

The circuit, shown Figure 1, depicts an application with two keys. The PIC16C54 is normally in SLEEP mode consuming very little operating current. If either of the two keys is pressed, the PIC16C5X wakes up, scans the keys and turns on one or both of the LEDs.

When SW1 is pressed, the green LED is lit and when SW2 is pressed the red LED is lit. The LEDs are used purely for demonstration purposes. In real life applications, a transmission would be completed before putting the PIC16C5X back to sleep.

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