The W78E52C/W78E052C is an 8-bit microcontroller with a wider frequency range and low power consumption. The W78E052C instruction set is fully compatible with the standard 8051. The W78E052C contains an 8K bytes Flash EPROM; a 256 bytes RAM; four 8-bit bidirectional and bit-addressable I/O ports; an additional 4-bit I/O port P4; three 16-bit timer/counters; a hardware watchdog timer and a serial port. These peripherals are supported
The W78E52C/W78E052C is an 8‑bit CMOS microcontroller compatible with the standard 8051 instruction set. It offers 8 KB Flash EPROM, 256 bytes RAM, four 8‑bit bi‑directional I/O ports, an extra 4‑bit port, three 16‑bit timer/counters, a full‑duplex UART, and a hardware watchdog timer. The device operates from a 4.5 V to 5.5 V supply and supports idle and power‑down power‑saving modes.
The datasheet is organized into sections covering general description, features, pin configurations and descriptions, functional blocks, security bits, electrical characteristics, timing waveforms, typical application circuits, package dimensions, and revision history. It also lists the eight interrupt sources and provides package options (DIP‑40, PLCC‑44, PQFP‑44).
| Flash EPROM size | 8 KB |
|---|---|
| RAM size | 256 bytes |
| Supply voltage range | 4.5 V to 5.5 V |
| Program memory address space | 64 KB |
| Data memory address space | 64 KB |
| I/O ports | Four 8‑bit ports + one 4‑bit port (P4) |
| Additional I/O port | 4‑bit port P4 |
| Timers / counters | Three 16‑bit timer/counters |
| Serial interface | Full‑duplex UART |
| Watchdog timer | Included |
| Interrupt sources | Eight sources, two‑level capability |
| Power‑saving modes | Idle and power‑down |
| Package options | DIP‑40, PLCC‑44, PQFP‑44 (RoHS) |
The microcontroller contains an 8 KB Flash EPROM.
It has four 8‑bit bi‑directional ports and an additional 4‑bit port (P4).
The device operates from 4.5 V to 5.5 V.
The microcontroller offers idle mode and power‑down mode, both selectable by software.