W77E58 8-bit microcontroller 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 W77E58 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. Consequently, W77E58 has the characteristics of high performance, low power consumption, and low cost.
The W77E58 is an 8‑bit CMOS microcontroller compatible with the 8051/8052 instruction set. It features a high‑speed core that executes most instructions in four clock cycles, delivering 1.5‑3× faster performance than a traditional 8052 at the same crystal speed. The device includes 32 KB Flash EPROM, 1 KB on‑chip SRAM, 256 bytes scratch‑pad RAM, four 8‑bit I/O ports plus an extra 4‑bit port, three 16‑bit timers, two full‑duplex serial ports, and 12 interrupt sources.
The manual covers pin configurations for DIP‑40, PLCC‑44, and QFP‑44 packages, detailed pin function tables, block diagrams, functional descriptions, power‑management modes (Idle, Power‑Down, Economy), and memory organization. It also provides electrical characteristics, package dimensions, and contact information for Winbond Electronics.
| Flash EPROM size | 32 KB |
|---|---|
| On‑chip SRAM | 1 KB |
| Scratch‑pad RAM | 256 bytes |
| Operating voltage | 4.5 V to 5.5 V |
| Maximum clock frequency | 40 MHz |
| I/O ports | Four 8‑bit ports + one 4‑bit port |
| Timers | Three 16‑bit timers |
| Serial ports | Two enhanced full‑duplex serial ports |
| Interrupt sources | 12 |
The W77E58 operates from 4.5 V to 5.5 V.
It includes 1 KB of on‑chip SRAM.
The device can run at frequencies up to 40 MHz.
The microcontroller provides 12 interrupt sources.