以下我们对W77E516单片机基本功能特征的简单介绍，仅供参考：

The W77E516 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 W77E516 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. The W77E516 contains In-System Programmable (ISP) 64 KB Flash EPROM; 4KB auxiliary Flash EPROM for loader program; operating voltage from 4.5V to 5.5V; on-chip 1 KB MOVX SRAM; three power saving modes.

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

64KB on-chip Mask-ROM

Four 8-bit I/O Ports; Port 0 has internal pull-up resisters enabled by software

One extra 4-bit I/O port and Wait State control signal

(available on 44-pin PLCC/QFP package)

Three 16-bit Timers

12 interrupt sources with two levels of priority

On-chip oscillator and clock circuitry

Two enhanced full duplex serial ports

64KB In-system Programmable Flash EPROM (APROM)

4KB Auxiliary Flash EPROM for loader program (LDROM)

256 bytes scratch-pad RAM

1KB on-chip SRAM for MOVX instruction

Programmable Watchdog Timer

Dual 16-bit Data Pointers

Software programmable access cycle to external RAM/peripherals