Thomas Kleffel wrote:

>Do I have to conect any other pins than Vcc, Vss, OSC1 and OSC2 for this
>test?

You probably need to tie /MCLR (pin 4) to +5V with a 1k resistor.

I recommend looking at the file "first.txt" from David Tait, which I think is
bundled with his PP programmer stuff. I'll send you a copy as his site is down.

Ok, here's David's circuit anyway:
<fixed>
              /
            +-O O---+---------------+--------------------+
            |       |               |                    |
            |       |          +----O----+               |
            | +     |          |   14    | PIC16C84      |
         -------    |   ____   |         |        ____   |
           ---      +--[____]--O 4    16 O----+--[____]--+
         -------         1K    |         |    |   4.7K   |
  4.5V     ---          ____   |         |    |          |
 battery -------    +--[____]--O 10      |   _|_        _|_
           ---     _|_  220    |    5    |   ___ 22pF   ___ 0.1uF
            | -    \ /^        +----O----+    |          |
            |      --- LED          |         |          |
            |       |               |         |          |
            +-------+---------------+---------+----------+
</fixed>

I found you can be slightly flexible with values. You don't need the LED on pin
10, its just for visible output.

>Is it possible, that if my software is broken it stops the clock?

<joke>You didn't accidently set Clock Inhibit did you?</joke>

Have fun.
-- 
Bob Cousins, Software Engineer.
Home page at http://www.lintilla.demon.co.uk/