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