At the moment it looked OK to have the LCDout inside the regularly called ISR, as it updatetd the LCD often. If the freq is low enough 1-2 Hz, it updates every second the LCD...
First thing that seems unusual to me is LCDOUT inside the ISR handler. That is something I would not do.
Secondly, there is a statement if freq < 68 then freq = 136 followed by freq = freq/68. As...
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Re: changing from 16f876 to 18f252 file to modify
Change according to your needs.
Ioannis Today, 23:22#CONFIG
CONFIG OSC = XT ; XT oscillator
CONFIG OSCS = OFF ; Oscillator system clock switch option is disabled (main...