For a project I need an analoge adjustable RC-oscillator on a 16F84. Beinga
newbe on PIC I dreamed up the following - not working - system (using PORT B
bits 6 and 7).
set PB7 to output high,
load a cap through a resistor out of this port (100K and 16 mf)
monitor the level on the cap on PB6 as input
As soon as PB6 is HI switch PB7 low to decharge the cap
PB6 monitors this and on LO switches PB7 HI again
and so on

Basically the same as a small oscillator with a NAND gate or ST.

It does not work, WHY? Where goes my reasoning wrong.
Thanks
Henk - V2GWK.