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Adil

Azerbaijan
2 Posts
Posted - 05/09/2008 :  09:59:43  Show Profile
Hello.

I am beginner on electronics. I am trying to program PIC16F84A using TOPWIN2005 USB programmer.
I have made simple schema for flashing one led.(4MHz crystal).
Now I want to program it. But it asks me about FOSC1,FOSC2,WDTEN,PWRITE, and many CPs.
What I must do? Which of them I must check?

Thanks.
Reply #1

Adil

Azerbaijan
2 Posts
Posted - 05/14/2008 :  09:45:12  Show Profile
I understand after looking datasheet of PIC16F84A.

bit 13-4 CP: Code Protection bit
1 = Code protection disabled
0 = All program memory is code protected
bit 3 PWRTE: Power-up Timer Enable bit
1 = Power-up Timer is disabled
0 = Power-up Timer is enabled
bit 2 WDTE: Watchdog Timer Enable bit
1 = WDT enabled
0 = WDT disabled
bit 1-0 FOSC1:FOSC0: Oscillator Selection bits
11 = RC oscillator
10 = HS oscillator
01 = XT oscillator
00 = LP oscillator

For external crystal must be set RC(11-FOSC1 and FOSC2 must be checked.)For HS FOSC1 must checked and FOSC2 must be unchecked and so. :)

Now my blinking led works very well
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