GENERAL DESCRIPTION

The W77E468 is a fast 8051 compatible microcontroller with a redesigned processor core without wasted clock and memory cycles. As a result, it executes every 8051 instruction faster than the original 8051 for the same crystal speed. Typically, the instruction executing time of W77E468 is 1.5 to 3 times faster then that of traditional 8051, depending on the type of instruction. In general, the overall performance is about 2.5 times better than the original for the same crystal speed. Giving the same throughput with lower clock speed, power consumption has been improved.

FEATURES

? 8-bit CMOS microcontroller

? High speed architecture of 4 clocks/machine cycle runs up to 40 MHz

? Pin compatible with standard 80C52

? Instruction-set compatible with MCS-51

? Six 8-bit I/O Ports and one 4-bit I/O Port

? Three 16-bit Timers

? 12 interrupt sources with two levels of priority

? On-chip oscillator and clock circuitry

? Two enhanced full duplex serial ports

? 32 KB flash Multiple-Time Programmable(MTP) ROM

? 256 bytes scratch-pad RAM

? 1 KB on-chip SRAM for MOVX instruction

? Programmable Watchdog Timer

? Dual 16-bit Data Pointers

? Hardware/Software optional variable access cycle to external RAM/peripherals

? Packages: - QFP 100: W77E468F-25/40