Hi All,

I'm trying to do some development with an 18F45K22 which is a device i've
not used before. Using MPLAB 8.76 and microchip c18.

I want to generate an interrupt every 1ms. So, I plan to use a CCP module i=
n
compare mode.

To that end, I started by configuring Timer 5 with Fosc/4. Here, I
discovered that whatever I do, MPLAB SIM does not increment the timer
registers, and therefore my timer interrupt does not fire - but it does wor=
k
on hardware.

Since there are a choice of timers, I changed to Timer 1 - and it does seem
to work in the simulator - registers increment and the timer1 interrupt
fires. However, when I reconfigure the code to use Timer 1 with CCP1, in
MPLAB SIM, the compare event never happens - the timer just sails through
the stored compare value and CCP1IF is never set.

However, again, my code works on actual hardware.

I've had a google around and not found anything that suggests why this
simulation doesn't work. Does anyone know anything about it?

thanks

Jon

To configure the CCP I use:-

// configure ccp
CCPTMRS0bits.C1TSEL =3D 0b00; // CCP1 to use Timer 1
CCPR1H =3D 0x3E; CCPR1L =3D 0x80; // 0x3e80 =3D=3D 16000
CCP1CONbits.CCP1M =3D 0b1010; // compare -> software interrupt only
T1CON =3D 0b00000011; // timer on, no prescaler, Fosc/4 clock
T1GCON =3D 0b00000000;
TMRH =3D 0x0000;
PIE1bits.CCP1IE =3D 1;

For now, all i do in the ISR is clear the CCP1IF and toggle a pin on Port B
so I can see some action on my scope. So, clearly on hardware my ISR is
called, but in the sim, it is not.
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