MPC89x51/52/53/54/58/515A is a single-chip 8-bit microcontroller with the instruction sets fully compatible with industrial-standard 80C51 series microcontroller.There is 63/32/16/15/8/4 Kbytes flash memory embedded for application program, which is shared with In-System Programming code. In-System-Programming allows the users to download new code while the microcontroller sits in the running state. There are 1280/512 bytes on-chip RAM embedded that are provided to implement wide field applications. PACKAGE 40 PIN DIP BRAND MEGAWIN DATASHEET