Key facts
- Brand
- Atmel
- Model
- AT89C55WD
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-11
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Atmel AT89C55WD Datasheet
The AT89C55WD is a low‑power, high‑performance 8‑bit CMOS microcontroller featuring 20 KB of flash memory, 256 bytes of RAM, 32 I/O lines, three 16‑bit timers, and a wide operating voltage range of 4 V to 5.5 V. It supports static operation from 0 Hz up to 33 MHz and includes a hardware watchdog timer, low‑power idle and power‑down modes, and eight interrupt sources.
The document includes a feature summary, pin configuration tables for PDIP, TQFP and PLCC packages, a block diagram, detailed pin descriptions, special function register maps, timer and interrupt register definitions, and package dimension data. Contact information for Atmel worldwide locations is also provided.
Atmel AT89C55WD specifications
| Flash Memory | 20 KB |
|---|---|
| RAM | 256 bytes (8‑bit) |
| I/O Lines | 32 programmable pins |
| Timers | Three 16‑bit timer/counters |
| Operating Voltage | 4 V to 5.5 V |
| Maximum Clock Frequency | 33 MHz |
| Interrupt Sources | Eight |
| Watchdog Timer | Hardware watchdog |
| Power‑saving Modes | Idle and Power‑down |
| Package Type | 40‑lead PDIP |
Source: Atmel AT89C55WD Datasheet
All Atmel AT89C55WD documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the flash memory size of the AT89C55WD?
The AT89C55WD contains 20 KB of reprogrammable flash memory.
How many I/O pins does the AT89C55WD provide?
It provides 32 programmable I/O lines.
What is the flash memory size of the AT89C55WD?
The device contains 20 KB of reprogrammable flash memory.
How much RAM does the AT89C55WD provide?
It provides 256 bytes of internal RAM.