16F877 Flickering LED

[koossa]

Here is my Circuit

[koossa]

Here is the Pin Names for the RFID Reader Module.
I'm ussing a 2N2222A Transistor at the RF Module.

[mister_e]

Depending of your actual code but... did you disable internal adcs?

ADCON1=7

set PORTA.3 to outpuit, set here to LOw at the begining?

are you sure of your actual schematic? looks weird.. What is the part number of your RF module?

[koossa]

Here is my code:




Include "Modedefs.bas"

DEFINE OSC 20 ' Set the Xtal frequency to 20mHz
RFVDDPin VaR PORTA.3 ' RF Module Power Pin.

Main:
ADCON1 = 7 ' Set Analog pins to Digital.
TRISA = 0 ' Set all PortA Pins as output
high RFVDDPin ' Switch RF Module On.
end

[koossa]

What is looking weird about my circuit?

[mister_e]

by using end this make your pic to stop or goto lalaland IMHO.

what about

DEFINE OSC 20 ' Set the Xtal frequency to 20mHz

ADCON1 = 7 ' Set Analog pins to Digital.
TRISA = 0 ' Set all PortA Pins as output
RFVDDPin VaR PORTA.3 ' RF Module Power Pin.


Main:
    high RFVDDPin ' Switch RF Module On.
here:
     goto here

also be sure you set the oscillator configuration fuse to HS.

[koossa]

"also be sure you set the oscillator configuration fuse to HS."

How do I do this?

[mister_e]

in your PIC programmer software or into your code
click here to know set fuse into your code

be sure you have a PIC who can handle the 20Mhz clock. PIC16F877-20