AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. It provides a highly-flexible and cost-effective solution to many embedded control applications.
The AT89S52 is a low‑power, high‑performance 8‑bit CMOS microcontroller featuring 8 KB of in‑system programmable flash, 256 bytes of RAM, and 32 programmable I/O lines. It operates from 4.0 V to 5.5 V and can run at frequencies up to 33 MHz, with three 16‑bit timer/counters, a full‑duplex UART, and a watchdog timer.
The document includes pin‑out diagrams for 40‑lead PDIP and 44‑lead PLCC packages, detailed port descriptions, the SFR map with reset values, and register tables such as the Timer/Counter 2 control register. Legal and contact information for Atmel are provided at the end of the file.
| Flash memory | 8 KB |
|---|---|
| Internal RAM | 256 bytes (8‑bit) |
| Programmable I/O lines | 32 |
| Operating voltage range | 4.0 V to 5.5 V |
| Maximum CPU frequency | 33 MHz |
| Timer/Counters | Three 16‑bit timers |
| UART | Full‑duplex serial channel |
The AT89S52 operates from 4.0 V to 5.5 V.
It provides 32 programmable I/O lines.
The device contains 8 KB of in‑system programmable flash memory.
The microcontroller can run up to 33 MHz.