The very first place to look is Philips homepage http://www.semiconductors.philips.com search for your P89C51RD2HBA Datasheet and find the homepage for
http://www.semiconductors.philips.com/pip/P89C5...51RD2.html P89C51RA2xx/RB2xx/RC2xx/RD2xx
http://www.semiconductors.philips.com/acrobat_d..._RD2_9.pdf P89C51RD2Hxx

Read also the erratas (i found this in esacademy forum)
http://www.semiconductors.philips.com/acrobat_d...091702.pdf

A Datasheet contains very useful information, always get the datasheet from the device you are going to work, analice and study the datasheet. Since you are not familiar with 8051, i suggest you first read the tutorial in this page (the button is on the left side)

By the way. Your first thread has 12 days, you were trying to program the device without knowing what has to offer the IC?

I search your 8051 in Philips and it is discontinued from what i read?????http://www.semiconductors.philips.com/acrobat_d...44exha.pdf search P89C51RD2HBA

Which compiler are you using?