Why not work

[a]

when i use pin_c0 show led by this code but pin_c0 is light all the time.
but when i use timer0 for change value in pin_c1. Pin_c0 is not light all the time but it blink like pin_c0-->on and off.Why?
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#include <16F877.h>
#device *=16
#device adc=10
#use delay(clock=4000000,RESTART_WDT)
#fuses NOWDT,XT, PUT, NOPROTECT, BROWNOUT, NOLVP, NOCPD, NOWRT, NODEBUG

#ZERO_RAM

#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include<string.h>

#define RS PIN_E0
#define RW PIN_E1
#define EN PIN_E2

#define leddison output_high(pin_c0)
#define leddisoff output_low(pin_c0)

char tmpshow[20];
int resetch1=0;

#int_TIMER0
TIMER0_isr()
{
if (resetch1==1)
{
output_high(pin_c1);
}
else
{
output_low(pin_c1);
}
}

void main()
{

int checkdisend=1;
long valueadc;
int sdis=0;

port_b_pullups(TRUE);
setup_adc_ports(A_ANALOG);
setup_adc(ADC_CLOCK_INTERNAL);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_counters(RTCC_INTERNAL,RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);

// enable_interrupts(INT_TIMER0); <====when i comment this line it work but when i not comment this line it error.
// enable_interrupts(GLOBAL); <====when i comment this line it work but when i not comment this line it error.

while(1)
{
set_adc_channel( 0 );
delay_ms(10);
valueadc = Read_ADC();

if (valueadc<=55)
{
resetch1=1;
}
else
{
resetch1=0;
}

if(!input(pin_b2))
{
checkdisend=0;
}

if( input(pin_b3)) //ถ้ายังไม่มีถ่านหรือว่า Discharge เสร็จแล้ว เป็น 1
{
output_low(pin_b4);
checkdisend=1;
leddisoff;
delay_us(10);
sdis=0;
}
else //ถ้า discharge ยังไม่เสร็จ เป็น 0
{
if(checkdisend==0)
{
output_high(pin_b4);
leddison;
delay_ms(500);
sdis=1;
checkdisend==0;
}
else
{
leddisoff;
delay_ms(500);
output_low(pin_b4);
checkdisend=1;
sdis=0;
}
}
}
}

[Guest]

checkdisend is always 1 so only leddisoff is called.
Maybe you'd want to write:
checkdisend=0;
instead of :
checkdisend==0;
in the "if(checkdisend==0) " branch.

[a]

thank you for your answer. But i recompile program. it have the same error. can i use pin_c0 and pin c1 seperate like output_high(pin_c0) or another but when i use c1. output of c0 is change it blink on off on off
but when i am not use pin c1. it ok pin c0 is light all the time until input(pin_b3)=1.
anyone can help me. Please.