i try to use pic16f877a for the first time..
i connected the following :
1- 10k resistor to pin 1
2- +5v to pin 11
3- GND to pin 12
4- 4MHz crystal to pin 13,14 just
and i tryed to light a led on portb.0 by this small code:
DEFINE OSC 4
TRISB = %11111110
MAIN:
PORTB.0 = 0
PUASE 200
TOGGLE PORTB.0
PUASE 200
GOTO MAIN
i programmed this code into pic16f84a and worked very well.
but in pic16f877a , there is no any output , led is off for ever.
i changed the crystal, and the voltage regulator, and the problem is still !!!
what is the probelm??
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