The AT89S8253 is a low-power, high-performance CMOS 8-bit microcontroller with 12K bytes of In-System Programmable (ISP) Flash program memory and 2K bytes of EEPROM data memory. The device is manufactured using Atmel’s high-density non-volatile memory technology and is compatible with the industry-standard MCS-51 instruction set.
The AT89S8253 is a low‑power, high‑performance CMOS 8‑bit microcontroller featuring 12 KB of in‑system programmable flash, 2 KB EEPROM, 256 B internal RAM and 32 programmable I/O lines. It includes three 16‑bit timer/counters, a programmable watchdog timer, enhanced UART and SPI interfaces, and operates from 2.7 V to 5.5 V with a CPU frequency up to 24 MHz.
The document provides detailed pin configurations for 40‑lead PDIP, 44‑lead PLCC and 42‑lead PDIP packages, descriptions of each port and special function registers, as well as block diagrams and register maps. It also lists package dimensions and mechanical drawing information for the various device outlines.
| Flash program memory | 12 KB |
|---|---|
| EEPROM data memory | 2 KB |
| Internal RAM | 256 B |
| Programmable I/O lines | 32 |
| Timer/Counters | Three 16‑bit |
| Operating voltage range | 2.7 V – 5.5 V |
| Maximum CPU frequency | 24 MHz |
| Watchdog timer | Programmable |
| Package options | 42‑pin PDIP, 40‑lead PDIP, 44‑lead PLCC |
The device contains 12 KB of in‑system programmable flash memory.
It provides 32 programmable I/O lines.
The microcontroller operates from 2.7 V to 5.5 V.
The CPU can run up to 24 MHz.