Key facts
- Brand
- Winbond
- Model
- W78C438C
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-11
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Winbond W78C438C Preliminary Manual
The W78C438C is a high‑performance 8‑bit CMOS microcontroller from Winbond, extending the W78C58 family with larger memory options and additional I/O ports. This manual describes its architecture, pin assignments, and programming model.
Key features include up to 40 MHz operation, 256‑byte on‑chip RAM, flexible memory mapping (64 KB program/1 MB data or chip‑select mode), five bidirectional I/O ports, a parallel port, three 16‑bit timers, four external interrupts, and a full‑duplex serial channel. Package options are 84‑pin PLCC and 100‑pin PQFP.
Winbond W78C438C specifications
| Microcontroller type | 8-bit CMOS |
|---|---|
| Design | Fully static |
| Maximum operating frequency | 40 MHz |
| On‑chip RAM | 256 bytes scratchpad |
| External memory options | 64 KB program / 1 MB data or 4 chip‑select pins |
| I/O ports | Five 8‑bit bidirectional ports + one parallel port |
| Timers/Counters | Three 16‑bit |
| External interrupts | Four |
| Serial interface | One full‑duplex channel |
All Winbond W78C438C documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What is the maximum operating frequency of the W78C438C?
The microcontroller can operate up to 40 MHz.
How many I/O ports does the W78C438C provide?
It provides five 8‑bit bidirectional I/O ports plus an additional parallel port.
What is the maximum operating frequency of the W78C438B?
The device can operate up to 40 MHz.
How many I/O ports does the W78C438B provide?
It has five 8‑bit bidirectional I/O ports and one additional 8‑bit parallel I/O port.