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The P89C51RD2 and 89CV51RD2 is not a drop in replacement. We have problems with the PCA counter used to generate a PWM signal using the 8 bit PWM mode. We need more then 256 counts and 1 pulse increments making the auto reload feature execellent. To get more pulses we made a software array with three PWM modules providing from 1 to 768 pulses, more can be added. This technique works flawless in the P89C51RD2 and fails to execute properly on both the 89CV51 and 89V51.