GENERAL DESCRIPTION

The W78C51D microcontroller supplies a wider frequency and supply voltage range than most 8-bit microcontrollers on the market. It is compatible with the industry standard 80C51 microcontroller series.

FEATURES

• Fully static design

• Supply voltage of 4.5V to 5.5V

• DC-40 MHz operation

• 128 bytes of on-chip scratchpad RAM

• 4K bytes of on-chip mask ROM

• 64K bytes program memory address space

• 64K bytes data memory address space

• Four 8-bit bidirectional ports

• Two 16-bit timer/counters

• One full duplex serial port

• Seven-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: W78C51D-24/40

- PLCC 44: W78C51DP-24/40

- QFP 44: W78C51DF-24/40