The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller featuring 4K bytes of in-system programmable Flash memory. Fully compatible with the industry-standard 8051 instruction set and pinout, this “S” variant modernized the classic AT89C51 by introducing serial In-System Programming (ISP) capabilities via an SPI interface. This allows developers to flash code directly on the circuit board without needing specialized parallel programmers.
Key Features
In-System Programmable (ISP) Flash: 4KB of onboard Flash memory supporting serial downloading for fast and convenient code updates.
Industry-Standard 8051 Architecture: Fully compatible with standard 8051 software instruction sets, compilers, and educational textbooks.
On-Chip RAM & I/O: 128 bytes of internal data RAM and 32 programmable digital I/O lines organized across four ports.
Precise Hardware Timers: Two 16-bit timer/counters for accurate interval counting, delays, and event tracking.
Full-Duplex UART: Dedicated serial communication port for connecting to computers, max232 drivers, or external serial modules.
Technical Specifications
Feature
Specification
Microcontroller Core
8051 Architecture (8-bit CMOS)
Max Speed
33 MHz
Flash Program Memory
4 KB (In-System Programmable)
RAM Data Memory
128 Bytes
Digital I/O Pins
32 Programmable I/O Lines (4 Ports)
Communication Interfaces
Full-duplex UART, SPI (for ISP programming)
Operating Voltage
4.0V – 5.5V
Weight
5.6 g
Dimensions
5.2 × 1.4 × 4.5 cm
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