GENERAL DESCRIPTION
The  W78LE516 is an 8-bit microcontroller which has an in-system programmable Flash EPROM for firmware updating. The instruction set of the  W78LE516 is fully compatible with the standard 8052. The W78LE516 contains a 64K bytes of main Flash EPROM and a 4K bytes of auxiliary Flash EPROM which allows the contents of the 64KB main Flash EPROM to be updated by the loader program located at the 4KB auxiliary Flash EPROM;512 bytes of on-chip RAM; four 8-bit bi-directional and bit addressable I/O ports; an additional 4-bit port P4; three 16-bit timer/counters; a serial port. These peripherals are supported by a eight sources two-level interrupt capability.

FEATURES
·  Fully static design 8-bit CMOS microcontroller
·  64K bytes of in-system programmable Flash EPROM for Application Program (APROM)
·  4K bytes of auxiliary Flash EPROM for Loader Program (LDROM)
·  512 bytes of on-chip RAM. (including 256 bytes of AUX-RAM, software selectable)
·  64K bytes program memory address space and  64K bytes data memory address space
·  Four 8-bit bi-directional ports
·  One 4-bit multipurpose programmable port
·  Three 16-bit timer/counters
·  One full duplex serial port
·  Eight-sources, two-level interrupt capability
·  Built-in power management
·  Code protection
·  Packaged in
-  DIP 40: W78LE516-24
-  PLCC 44: W78LE516P-24
-  QFP 44: W78LE516F-24