Using #INT_RB in 16F877

[oguzmania]

Hi from Turkiye.I am newbie of this forum and CCS C and PIC.
Firstly i am sorry for my bad English.

If I explain my project;

I have 4 equivalent sound detector circuit and then i will use op-amp in the exit of this 4 circuits.If detector detects sound op-amp (comparator) shows +5V , if not it shows 0 V.

This detector circuit's microphones are in different points.So if i send a sound signal ,the signal arrives this detectors in different times.

So I want to find this different times.(Or time differences)

Firstly i am using 16F877 and exit of comparator line combined RB<4:7>
For example;
1.detector:RB4
2.detector:RB5
3.detector:RB6
4.detector:RB7

I want to find time differences with using INT_RB and Timer1.
I set Timer 1 with using my conditions.(Example; using sound velocity etc...)

I don't want to using Timer 1 with it's interrupt.

For example this time differences;
1.detector:0 second
2.detector:120us
3.detector:2000us (2ms)
4.detector:25000us (25ms)

In my calculation i must measure 30us to 30 msn (Timer 1 64536-65536)

But i didn't make it in CCS.

I want;

if detector1 is logical1;
if (input(pin_b4))
timer 1 starts
and time1=0

if (input(pin_b5))
time2=get_timer1()

if (input(pin_b6))
time3=get_timer1()

if (input(pin_b7))
time4=get_timer1()

I want to find with time differences not using interrupt timer 1.

And when RB<4:7>pins 5V-->0V i don't want a new interrupt.

I am waiting your answers.I hope i explained my problem...

Peace be with you...

Oguz

[PCM programmer]

Look at this CCS example file. You can set it to detect a "low to high"
edge on the input signal, or a "high to low" edge.