Frequency Counter

[skimask]

Break it down, make it simple, build it back up.
Erase the chip, Blank check it, make sure both program and eeprom space reads back as $ff, then try this:

@ DEVICE PIC12F683, INTRC_OSC_NOCLKOUT
@ DEVICE PIC12F683, WDT_ON
@ DEVICE PIC12F683, PWRT_ON
@ DEVICE PIC12F683, MCLR_OFF
@ DEVICE PIC12F683, BOD_ON
@ DEVICE PIC12F683, CPD_OFF
@ DEVICE PIC12F683, PROTECT_OFF
 
temp var byte
temp2 var byte
ledpin var gpio.(pick a pin)
output ledpin

main:
'show a heartbeat for the program on an LED to make sure something is happening
temp2 = temp2 + 1 : ledpin = temp2.0

for temp = 0 to 255 : write temp, temp : next temp : goto main
end

Hook an LED to a pin, let it blink a few times, then do a readback on the PIC. That should tell you if your eeprom statement is working in the first place. Then build it back up...

[mister_e]

The internal oscillator is set @4MHz by default, you can set OSCCON register to go to 8MHz.

As usual i'll suggest you to use a internal Timer (TMR0 or TMR1) as counter. Yes you'll have to use the dedicated pins for that... no harm at all, you have tons of benefits.
1. it runs in background
2. it's more accurate
3. use less code space
4. more flexible

This PIC have this cute and handy CCP module, so you'll be able to generate the PWM signal really easy using HPWM or by setting the according register manually. This also run in background.

HTH