Gladwin,
That's a terribly old chip ! Takes me back - I used to use a lot of them.

See the manual here
http://www.keil.com/dd/docs/d...515_um.pdf

READ pages 82 onward - everything you need is there.
From old memories,
Set CRCL and CRCH to the reload value for the PWM rate you want.
Set Timer 2 to autoreload, saves you doing anything in code.
Set compare mode to 0.
Set CCHn and CCLn to whatever your PWM signal requires
Set TR2.

...and it all happens.

Steve