Resolution on tmr0

[pitufos]

Hi
I need your comments on this code...
Well... I need count time spend of complete signal. On this code i can only resolution in ms... I need resolution in us...but much better precision...


#include <16F84A.h>
#fuses XT, NOWDT, PUT
#use delay(clock=4000000)

byte ms;

#int_rtcc
clock_isr()
{
ms++;
}

void discarrega()
{
output_B(0x52);
if (input(PIN_A2) == 0 )
{
output_high(PIN_A3);
output_low(PIN_A3);
}

output_B(ms);
if (input(PIN_A2) == 0 )
{
output_high(PIN_A3);
output_low(PIN_A3);
}
}

void main()
{
set_timer0(231);

setup_timer_0(RTCC_INTERNAL | RTCC_DIV_4);
enable_interrupts(GLOBAL | INT_RTCC);

//setup_counters(RTCC_INTERNAL, RTCC_DIV_4 | RTCC_8_BIT);
//enable_interrupts(GLOBAL);
//enable_interrupts(INT_RTCC);

set_tris_B(0);

while (true)
{
if (!input(PIN_A0))
{
while (!input(PIN_A0));
set_timer0(231);
ms = 0;
while (input(PIN_A0));
while (!input(PIN_A0));
discarrega();
delay_ms(100);
}
}
}

thanks...

[Neutone]