PICDEM-1 User’s Guide
3.1
Main Routine
The tutorial program is extremely simple. It begins by configuring PORTB as
all outputs to drive the eight LEDs and initializing a counter. Then it waits in an
infinite loop until S3 is pressed. This increases the counter by one, and this
number is displayed in binary on the LEDs. Once the count reaches FFh, the
next S3 press will roll the count back to 00h.
Start
Configure PORT B
Zero Counter
Switch S3
pressed?
Yes
Increase Counter
Display count on LEDs
Switch S3
released?
Yes
Figure 3.2: Main Routine
No
No
DS33015C-page 12
? 1999 Microchip Technology Inc.
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