for most of the time and wake-up only when a key is pressed.
FIGURE 1:
4 KEY INTERFACE TO PIC16CXXX
4x1k LED1 LED2 LED3 LED4 SW1 SW2 SW3 SW4 4x100Ω
RB0 RB1 RB2 RB3 RB4 RB5 RB6 RB7 PIC16CXXX
IMPLEM.
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