MCHPAT89S51-24AU
Overview
The AT89S51-24AU is a low-power, high-performance 8-bit microcontroller based on the classic MCS-51 architecture, featuring 4KB of In-System Programmable (ISP) Flash memory. Operating at speeds up to 24MHz, it provides a robust and well-documented foundation for legacy system maintenance and simple control applications. This variant is housed in a 44-pin TQFP surface-mount package and includes 32 programmable I/O lines and a built-in watchdog timer.
Why Choose This Part
The primary advantage is its In-System Programming (ISP) capability, which allows the 4KB of Flash memory to be reprogrammed while the chip is soldered into the application circuit. It features a dual data pointer for efficient memory addressing and a hardware watchdog timer to improve system reliability in the event of software hang-ups. Additionally, its fully static operation allows the clock frequency to be reduced to DC for extreme power saving without losing data.
Applications
Key Specifications
Getting Started
To develop for the AT89S51, use an 8051-compatible compiler such as Keil C51 or the open-source SDCC. Programming the chip requires an ISP programmer capable of handling the SPI-based programming interface. Hardware prototyping is best achieved with a standard 8051 development board or by using a TQFP-to-DIP adapter on a breadboard.
AT89S51-24 Family
Comparing specs that differ across variants. The current part is highlighted.
| Part Number | Package | Stock |
|---|---|---|
| AT89S51-24AU (this part) | TQFP-44 | 5,533 |
| AT89S51-24PU | DIP-40 | 2,008 |
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