Hi All!

My configuration:
at89c51ed2 mcu,
Keil mVision 2,
I use Keil PCA simulations (Peripherals>Timers>...).

I have configured PCA module 0 as sw-timer.
Each time the irq subroutine starts, i increase CCAP30L/H.
If i use rather small increasing value - sometimes
CH/CL becomes more than CCAP30L/H, but irq subroutine doesn't starts, until CH/CL owerflow happen and CH/CL becomes less than CH/CL.

Why irq subroutine doesn't starts?
Maybe it's a kind of Keil bug?
Help me please.
Thanks, greatly.