GENERAL DESCRIPTION

The W78C801 is an 8-bit microcontroller which can accommodate a wide frequency range with low power consumption. The instruction set for the W78C801 is fully compatible with the standard 8051. The W78C801 contains an 4K bytes Mask ROM; a 256 bytes RAM; four 8-bit bi-directional and bitaddressable I/O ports; an additional 6-bit I/O port P4; two 16-bit timer/counters; a hardware watchdog timer. These peripherals are supported by a twelve sources two-level interrupt capability. The W78C801 does not contain serial port.

FEATURES

? Fully static design 8-bit CMOS microcontroller

? DC-40 MHz operation

? 256 bytes of on-chip scratchpad RAM

? 4 KB Mask-ROM

? 64 KB program memory address space

? 64 KB data memory address space

? Four 8-bit bi-directional ports

? Two 16-bit timer/counters

? Watchdog Timer

? Direct LED drive outputs

? Twelve sources, two-level interrupt capability

? Wake-up via external interrupts at Port 1

? EMI reduction mode

? Built-in power management

? Code protection mechanism

? Packages:

- DIP 40: W78C801-24/40

- PLCC 44: W78C801P-24/40

- PQFP 44: W78C801F-24/40