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I'am using mplab 7.30b.
Sorry i don't understand this :

If you want to read TMR1H you will have to add reads of TMR1L to your code.

Ok so what the view/"special function register" is displaying ...

I won't have access to labs until tomorrow and this must be an mplab bug , no 16bit register are simulated right. I have also checked the TxCON registers, they'r all fine.

Ok thanks, i'm going to work on this.

Even with this safer code i still have the problem.

#include<18f452.h>
#use delay (clock = 20000000)
int32 z;
#int_timer1
void tmr1_isr()
{
z=0;
}

void ma ...

I know this sound weird but it's exactly what it does , the transition is 0x00ff->0x0000, i tried to force the register TMR1H to 0xFF and the result is 0xffff->0xff00, i tried to set a divisor, ...

There is my problem, the isr is run every time TMR1L reaches 255, is this normal ? i'd like it to be run only when it reaches 65535.

#include<18f452.h>
#use delay (clock = 20000000) ...