Timer Interrupt help please

[chapmjw]

Can some one please post an example using the timer interrupt for the 4013. I'm not getting anywhere with the datasheet or help.
thanks
jim

[chapmjw]

Here's my crack at the timer interrupt. Just a modification of the Pascal example.

void Timer1Int() org 0x1A
How do we know that the address of this interrupt is 0x1A? I don't see a reference in any documentation.



// timer interrupt
void init()
{
TRISB = 0;
LATB = 255;
ADPCFG= 0XFFFF;
}

void InitTimerInterrupt()
{
IPC0.F12 = 1; // interrupt priority level = 1
IFS0.F3 = 0; // clear TMR1IF
IEC0.F3 = 1; // enable Timer1 interrupts
T1CON.F4 = 0; // timer prescaler bit 4-5 1:1,1:8,1:64,1:256
T1CON.F5 = 1; // timer prescaler bit 4-5 1:1,1:8,1:64,1:256
T1CON.F15 = 1; // Timer On
}

void Timer1Int() org 0x1A
{
IFS0.F3 = 0;
LATB = ~PORTB;
}

int main()
{
init();
InitTimerInterrupt();
while(1) { }
}

[zristic]

How do we know that the address of this interrupt is 0x1A? I don't see a reference in any documentation.

[rolfz]

Had same problem

Found out that the address to add to the interrupt routine is:

(Vector Number)*2+4, converted in hex

Explanation

Vector table starts at address 4 and each address uses 2 bytes.

KR
Rolfz