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Please help me "PCA interrupt in MCS51"

Hi My name is Jirasak from thailand . I have some problem with PCA interrupt in MCS51.
Please help me share or get some idea with how to use PCA interrupt.

My condition : Controller 89C51AC2 (Board CP-JR51AC2 : ATMEL)

Programming : If we have switch input at port P0_1 then controller generate square wave (PWM) 100 Hz at port PWM0 by use PCA interrupt module.

Please Help Me or share some idea,

Best Regard

Jirasak B.

Thank You