The W78E54B 8-bit microcontroller is 8051 compatible and has low power consumption and a wider frequency range.
The W78E54B is an 8‑bit CMOS microcontroller with a 16 KB Flash EPROM, 256 bytes of RAM, four 8‑bit bi‑directional I/O ports, an extra 4‑bit port, three 16‑bit timer/counters, a full‑duplex UART and an integrated watchdog timer. It operates from 4.5 V to 5.5 V and supports idle and power‑down power‑reduction modes.
The manual provides pin configurations for DIP‑40, PLCC‑44 and PQFP‑44 packages, functional block diagrams, detailed descriptions of peripherals, and guidance on power management, EMI reduction, and watchdog timer configuration.
| Flash EPROM | 16 KB |
|---|---|
| RAM | 256 bytes |
| Supply voltage | 4.5 V to 5.5 V |
| Package options | DIP‑40, PLCC‑44, PQFP‑44 |
| Timers | Three 16‑bit timer/counters |
| Serial port | Full‑duplex UART |
| Watchdog timer | Integrated watchdog timer |
It supports two power‑reduction modes: idle mode and power‑down mode, both selectable by software.
The device provides four 8‑bit bi‑directional I/O ports and an additional 4‑bit bit‑addressable port P4.
The microcontroller operates from 4.5 V to 5.5 V.