>I'VE GOT A 32768Hz WATCH XTAL CONNECTED TO A PIC84 IT HAS A Rs VALUE
>OF 22k (25K RECOMMENDED BY THE MANUFACTURER) AND TWO 10pF CERAMIC
>CAPS TO GROUND. THE OSCILLATOR OUTPUT ON PIN 15 HAS A PERIOD OF
>4.96uS. IT SHOULD BE 30.517uS SHOULD'NT IT ( IF THE CLOCK OUT IS /4
>THEN THIS WOULD GIVE 122uS ).
I used around 100pf capacitors & 10K ohms (but I'm guessing). It works.
Check your oscillator programming fuses (did you tell the PIC its an RC?).
Are you using a breadboard? A year back, I had a nasty problem with the
oscillator malfunctioning depending on what was under the breadboard- my
steel desk changed the capacitance of the circuit.
More... (looser matching)
- Last day of these posts
- In 1995
, 1996 only
- New search...