The device uses Microchip high-density, nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. On-chip flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. This powerful microcontroller is suitable for many embedded control applications. For pricing and availability, contact Microchip Local Sales. Development Environment.

Author:Malak Doktilar
Language:English (Spanish)
Genre:Personal Growth
Published (Last):6 May 2010
PDF File Size:10.12 Mb
ePub File Size:2.7 Mb
Price:Free* [*Free Regsitration Required]

Before going into detail, we should get some brief idea about microcontroller AT89S It is 40 pin microcontroller, and has 4 ports P0,P1,P2,P3 , each port have 8 pins. We can consider each port as 8 bit register, from the software point of view. Some pins have the Dual functionality, which has been mentioned in bracket in Pin Diagram below.

Dual functionally like for interrupt, counters, timers etc. We are using pin one of port 1 to connect the LED. We have connected a crystal oscillator of Crystal oscillator is used to generate clock pulses, and clock pulse is used to provide the mean for timing calculation, which is mandatory to synchronise all the events. These type of crystals used in almost every modern digital equipment like in computers, watches etc.

Most commonly used Crystal is quartz. It's a resonant oscillator circuit and capacitors are used to oscillate the crystal, so we have connected here 22pf capacitors.

Pin 31 EA is connected to Vcc, which is an active low pin. This should be connected to Vcc when we are not using the any external memory. Pin 30 ALE and pin 29 PSEN are used to connect microcontroller to the external memory and Pin 31 tells microcontroller to use external memory, when connected to Ground. We are not using any external memory so we connected Pin31 to Vcc. It resets the microcontroller when connected to HIGH.

Header REGX There are many types of variables and constants in embedded C like int, char, unsigned int, float etc, you can learn them easily. Here we are using unsigned int whose range is from 0 to In , 1 machine cycle requires 12 crystal pulses to execute and we have use So we can understand by simply interfacing LED with microcontroller , that with a simple coding that, we can interact and control the hardware through software programming using microcontroller.

Also we can manipulate each port and pin of microcontroller through programming. I am new to this embedded programming hope you will help me I' m compiling the program for AT89S52 microcontrller. Will the circuit works if I do not use reset circuit?

Yes, it should work. Now I want to programm the microcontroller, what things do I need? How many LED's 0. Please tell Me if any one know Get Our Weekly Newsletter! Helena St. Related Content.

Controlling Light using Touch Sensor and Microcontroller. Android Controlled Robot using Microcontroller. Digital Thermometer using LM35 and Microcontroller. Digital Clock using Microcontroller. Interfacing ADC with Microcontroller. Hi I am new to this embedded programming hope you will help me Thanks Vijay. Log in or register to post Comment.


Atmel AT89 series

Note: The datasheet of the AT89S52 Microcontroller and more detailed Features can be found at the bottom of this page. Since it is similar to the trust worthy architecture these microcontrollers are as per industry standard. The Microcontroller also has Operating mode, Idle Mode and Power down mode which makes it suitable for battery operated applications. However you can utilise external modules for the same. Atmel microcontroller can be programmed with different software's that is available in the market. Arduino, Keil uVision are the most used platforms to name a few.


Microcontroller 8051/89S52 Embedded C Programming

Hello, this very post is related to the RPM meter project. You must first of all glance over the project here. A simpler architecture can be represented below. Those ports can be used to output DATA and orders do other devices, or to read the state of a sensor, or a switch. Most of the ports of the 89S52 have 'dual function' meaning that they can be used for two different functions.

Related Articles