The AT89S52 is less power-consuming, highly reliable, has the ability to get data up to eight-bit, and is constructed with the CMOS (Complementary metal-oxide-semiconductor) technique. This post will share the AT89S52 pinout, datasheet, CAD Model, Features, and application.

ⅠAT89S52 Description

The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. Combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcontroller that provides a highly-flexible and cost-effective solution to many embedded control applications.

AT89S52 integrates a general-purpose 8-bit CPU, memory (including RAM and Flash ROM), parallel IO interface, timer/counter, interrupt control functions, etc. on one chip, and the functional modules in the chip are connected to each other through the internal bus. AT89S52 has three package structures, and the pin arrangement of the PDIP package is shown in Figure 4.1. The main functional modules of the AT89S52 microcontroller are introduced as follows.

ⅡCAD Model

Symbol

Figure1-1 Symbol

Footprint

Figure1-2 footprint

CAD Model

Figure1-3 CAD Model

ⅢAT89S52 Pinout

 40-lead PDIP 

Figure1-40-lead PDIP 

44-lead PLCC

Figure2-44-lead PLCC

lead TQFP

Figure3-44-lead TQFP

ⅣAT89S52 Pin Configuration

ⅤAT89S52 Microcontroller Features

ⅥAT89S52 Specifications

ⅦAT89S52 Features

• Compatible with MCS®-51 Products
• 8K Bytes of In-System Programmable (ISP) Flash Memory – Endurance: 10,000 Write/Erase Cycles
• 4.0V to 5.5V Operating Range
• Fully Static Operation: 0 Hz to 33 MHz
• Three-level Program Memory Lock
• 256 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Three 16-bit Timer/Counters
• Eight Interrupt Sources
• Full Duplex UART Serial Channel
• Low-power Idle and Power-down Modes
• Interrupt Recovery from Power-down Mode
• Watchdog Timer
• Dual Data Pointer
• Power-off Flag
• Fast Programming Time
• Flexible ISP Programming (Byte and Page Mode)
• Green (Pb/Halide-free) Packaging Option

ⅧAT89S52 Block Diagram

Figure4-40-lead PDIP 

ⅨHow to Select your Atmel Microcontroller

Microchip provides a wide variety of Microcontrollers from the PIC family and the Atmel Family. Their collection has just piled up after Microchip acquired Atmel. Each MCU has its own advantage and disadvantage. There are many parameters that one has to consider before selecting an MCU for his/her project. The below points are suggestions that might help one select an MCU.

• If you are a beginner learning Microcontroller, selecting an MCU with good online community support and wide applications will be a good choice. For Atmel AT89S52 or ATmega328 will be a good choice.
• Consider the operating voltage of your system. If they are 5V then select a 5V MCU some sensors or devices work and communicate on 3.3V in such case a 3.3V MCU can be selected
• If size and price are limitations then you can choose small 8-pin MCUs like Attiny1614. These are also comparatively cheaper.
• Based on the sensors and actuators used in your project, verify which modules you might need for MCU. For example, is you are reading many Analog voltages then make sure MCU has enough ADC channels and supportive resolution. The details of all modules are given in the table above.
• If your project involves communication protocols like UART, SPI, I2C, CAN, etc make sure your MCU can support them. Some MCU can support more than one module of the same protocol

ⅩApplications

• Multiple DIY Projects
• Excellent choice if you are learning ATmel
• Projects requiring Multiple I/O interfaces and communications
• Replacement for Arduino Module
• Ideal for more advanced level A/D applications in automotive, industrial, appliances, and consumer applications.

Ⅺ AT89S52 Package PSDIP

Figure5-package

Ⅻ How to program AT89S52 8-bit Microcontroller

Different software and compilers available in the market can be used to program the Atmel microcontrollers family.

Support Compilers

Components Needed

• IDE
• IPE
• a suitable compiler
• a programmer/debugger to develop a program

A programming environment is what an IDE (Integrated Development Environment) is there to deliver. The software is transformed into readable HEX files by the compiler. HEX files are burned in AVR MCUs using the IPE (Integrated Programming Environment). We frequently use Keil uVision IDE for IDE.

USBASP is an In-circuit programmer/debugger which plays an integral role in programming microcontrollers. It supports In-Circuit-Serial-Programming and is operated by a computer to burn the code into AT89S52 8-bit microcontroller. For hardware programming, it is purchased separately. It is advised to simulate the program beforehand on the software for optimization and error-free programs. Furthermore, hardware like a 12 Volts adapter, 7805 Voltage Regulator, Crystal Oscillator, and capacitors are required.

The picture below is the connection diagram for programming the AT89S52 controller:

Figure4- connection diagram 

XIII AT89S51 vs AT89S52

AT89S51:

• 8051-based Full Static CMOS controller with Three-Level Program Memory Lock, 32 I/O lines, 2 Timers/Counters, 6 Interrupts Sources, Watchdog Timer, 2 DPTRs 4K Flash, 128 Bytes On-chip RAM.
•  

AT89S52:

• 8051-based Full Static CMOS controller with Three-Level Program Memory Lock, 32 I/O lines, 3 Timers/Counters, 8 Interrupts Sources, Watchdog Timer, 2 DPTRs, 8K Flash Memory, 256 Bytes On-chip RAM.
• In AT89S52, user RAM is from 00H to FFH. In this lower 128 bytes are both directly and indirectly addressed. The upper 128 bytes are only indirectly addressed.

In AT89S52, all the ports are dual-functionality whereas in AT89S51, only three ports are.

XIV AT89S52 PDF

AT89S52 Datasheet