After successful program upload, decouple the PIC from the burner circuit and install it
within the following test circuit:
This test circuit utilizes an external quarz < 4MHz as a clock. That corresponds to the
setting of XT_OSC within the configuration word (0x3FF1) of the sample program (see
specification of the PIC16F84A).
If the PIC has been programmed correctly, the LED will start flashing as soon as a power
source (+5V) is connected to the test circuit. The push button switch is optional and
brings the PIC into RESET-state when pressed (MCLR#=LOW). Program execution is
halted then, so the LED is permanently off. The flash frequency can be influenced via
quarz-frequency selection (hardware) or by changing the number of iterations of the outer
delay loop (software) in line 310 of the sample program, range 1..255.
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