The W78E52B is an 8-bit microcontroller which can accommodate a wider frequency range with low power consumption.
The W78E52B is an 8‑bit microcontroller compatible with the standard 8051 instruction set. It provides an 8 KB multiple‑time‑programmable ROM, 256 bytes of RAM, four 8‑bit bi‑directional I/O ports, an additional 4‑bit port, three 16‑bit timers, a watchdog timer and a full‑duplex UART. The device operates over a wide supply voltage range of 4.5 V to 5.5 V and includes power‑saving idle and power‑down modes.
The manual details pin configurations for DIP‑40, PLCC‑44 and PQFP‑44 packages, describes the block diagram, explains the operation of timers, ports and the watchdog, and provides programming and erase procedures for the on‑chip MTP‑ROM. Typical application circuits and package dimensions are also included.
| Supply voltage | 4.5 V to 5.5 V |
|---|---|
| ROM size | 8 KB MTP‑ROM |
| RAM size | 256 bytes |
| Timers | Three 16‑bit timer/counters |
| Serial interface | Full‑duplex UART |
| Package options | DIP‑40, PLCC‑44, PQFP‑44 |
The device operates from 4.5 V to 5.5 V.
The microcontroller supports an idle mode and a power‑down mode, both selectable by software.
The on‑chip ROM is an 8 KB multiple‑time‑programmable (MTP) ROM.