Technical data sheet for the Atmel AT89S52 8‑bit microcontroller, covering specifications, pinout, registers and operation modes.
The AT89S52 is a low‑power, high‑performance CMOS 8‑bit microcontroller with 8 KB in‑system programmable flash memory, 256 B RAM and 32 programmable I/O pins. It includes three 16‑bit timers/counters, a full‑duplex UART, a watchdog timer and supports both idle and power‑down modes.
The document provides detailed information on pin functions, special function registers, memory organization, interrupt control, oscillator characteristics, and programming procedures for flash memory, including required voltage levels and timing sequences. This manual is written in Chinese.
| Flash memory | 8 KB in‑system programmable |
|---|---|
| RAM | 256 B |
| I/O pins | 32 programmable I/O pins |
| Timers/Counters | Three 16‑bit timers/counters |
| UART | Full‑duplex serial channel |
| Watchdog timer | Integrated watchdog timer |
| Idle mode frequency range | 0 Hz – 33 Hz |
The AT89S52 contains 8 KB of in‑system programmable flash memory.
It provides 32 programmable I/O pins.
The device includes three 16‑bit timers/counters.
The watchdog timer resets the device after a timeout unless it is periodically refreshed via the WDTRST registers.