Key facts
- Brand
- Winbond
- Model
- W78C52D
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-11
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Winbond W78C52D 8-BIT MICROCONTROLLER User Manual
This manual describes the W78C52D microcontroller, highlighting its wider frequency and supply voltage range, compatibility with the 80C52 series, and its on‑chip resources such as RAM, ROM, timers, and serial port. It includes detailed pin configurations, functional block diagrams, and electrical characteristics.
Additional sections cover power‑management features (idle and power‑down modes), the watchdog timer operation, absolute maximum ratings, and example application circuits. Package dimensions for DIP, PLCC, and QFP variants are also provided.
Winbond W78C52D specifications
| Supply voltage range | 4.5 V to 5.5 V |
|---|---|
| Maximum operating frequency | DC‑40 MHz |
| On‑chip RAM | 256 bytes |
| On‑chip ROM | 8 KB mask ROM |
| Operating temperature range | 0 °C to 70 °C |
| Idle current (5 V, 20 MHz) | 6 mA |
| Power‑down current (5 V, no load) | 50 µA |
| Number of 8‑bit I/O ports | Four |
| Extra bit‑addressable I/O port | 4‑bit (Port 4) |
| Additional external interrupts | INT2, INT3 |
All Winbond W78C52D documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the supply voltage range of the W78C52D?
The device operates from 4.5 V to 5.5 V.
How many I/O ports does the W78C52D provide?
It has four 8‑bit bidirectional ports plus an extra 4‑bit bit‑addressable port (Port 4).
What supply voltage range does the W78C52D support?
The microcontroller operates from 4.5 V to 5.5 V.
What power‑management modes are available?
It has two software‑selectable power‑reduction modes: idle mode and power‑down mode.