GENERAL DESCRIPTION
The W78L54 microcontroller supplies a wider frequency and supply voltage range than most 8-bit microcontrollers on the market. It is compatible with the industry standard 80C54 microcontroller series. The W78L54 contains four 8-bit bidirectional parallel ports, one extra 4-bit bit-addressable I/O port (Port 4) and two additional external interrupts (INT2 , INT3 ), three 16-bit timer/counters, one watchdog timer and a serial port. These peripherals are supported by a eight-source, two-level interrupt capability. There are 256 bytes of RAM and an 16K byte mask ROM for application programs.

FEATURES
· Fully static design
· Supply voltage of 1.8V to 5.5V
· DC-24 MHz operation
· 256 bytes of on-chip scratchpad RAM
· 16K bytes of on-chip mask ROM
· 64K bytes program memory address space
· 64K bytes data memory address space
· Four 8-bit bidirectional ports
· Three 16-bit timer/counters
· One full duplex serial port
· Eight-source, two-level interrupt capability
· One extra 4-bit bit-addressable I/O port
· Two additional external interrupts INT2 / INT3
· Watchdog timer
· EMI reduction mode
· Built-in power management
· Code protection
· Packages:
     - DIP 40: W78L54-24
     - PLCC 44: W78L54P-24
     - QFP 44: W78L54F-24