Datsaheet for STC90C51RD microcontroller family. Included: STC90C51STC90C51,STC90C52,STC90LE51,STC90LE52,STC90C51RC,STC90C52RC,STC90C53RC,STC90C12RC,STC90LE51RC,STC90LE52RC,STC90LE53RC,STC90LE12RC,STC90C54RD+,STC90C58RD+,STC90C510RD+,STC90C512RD+,S