GENERAL DESCRIPTION
The W78LE52 is an 8-bit microcontroller which can accommodate a wider frequency range with low power consumption. The instruction set for the W78LE52 is fully compatible with the standard 8051. The W78LE52 contains an 8K bytes MTP ROM (Multiple-Time Programmable ROM); a 256 bytes RAM; four 8-bit bi-directional and bit-addressable I/O ports; an additional 4-bit I/O port P4; three 16- bit timer/counters; a hardware watchdog timer and a serial port. These peripherals are supported by eight sources two-level interrupt capability. To facilitate programming and verification, the MTP-ROM inside the W78LE52 allows the program memory to be programmed and read electronically. Once the code is confirmed, the user can protect the code for security.

FEATURES
• Fully static design 8-bit CMOS microcontroller
• Wide supply voltage of 2.4V to 5.5V
• 256 bytes of on-chip scratchpad RAM
• 8 KB electrically erasable/programmable MTP-ROM
• 64 KB program memory address space
• 64 KB data memory address space
• Four 8-bit bi-directional ports
• One extra 4-bit bit-addressable I/O port, additional INT2 / INT3
   (available on 44-pin PLCC/QFP package)
• Three 16-bit timer/counters
• One full duplex serial port(UART)
• Watchdog Timer
• Eight sources, two-level interrupt capability
• EMI reduction mode
• Built-in power management
• Code protection mechanism
• Packages:
   - DIP 40: W78LE52-24
   - PLCC 44: W78LE52P-24
   - PQFP 44: W78LE52F-24