GENERAL DESCRIPTION

The W78LE54 is an 8-bit microcontroller which can accommodate a wide supply voltage range with low power consumption. The instruction set for the W78LE54 is fully compatible with the standard 8051. The W78LE54 contains an 16K 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 MT-PROM inside the W78LE54 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

? 16 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: W78LE54-24

- PLCC 44: W78LE54P-24

- PQFP 44: W78LE54F-24