• June 13, 2019

89C51 or AT89C51 is an 8-bit microcontroller and belongs to Atmel’s family . Pdf of AT89C51 datasheet & pin diagram are also available at Engineers. AT89CPI Microchip Technology / Atmel 8-bit Microcontrollers – MCU UNSAWN WAFER 21 MIL BACKGRIND 89C51 – 24MHZ, PDIP, IND TEMP datasheet. Disclaimer: Whilst information is supplied in good faith, we are not liable for any errors or omissions. Please consult the relevant Atmel datasheet. E&OE. Key.

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AT89CPC – AT89C51 Pin 24MHz 4kb 8-bit Microcontroller Technical Data

TMOD is an 8-bit register in which the lower 4 bits are set aside for timer 0 and the upper 4 bits are set aside for timer 1. In other words, the multiplexes address and data through port 0 to save pins. The below points are just suggestions which might help one to select a MCU.

But, since the AT89C51 has a strong community support if your motive is to learn embedded then AT89C51 can still be a good choice. Since the 89C51 has an 8-bit architecture, each bit timer is accessed as two separate registers of low byte and high byte.

The rest must be accessed in byte format. It can be programmed to operate at different baud rates.

Atmel AT89C51

If you are planning on serious programming and expansion with community support then Keil is recommended. It works with the popular architecture and hence is used by most beginners till date. Port 3; is a dual — purpose port on pins No alternate functions are as signed for Port 1 pins; thus they are used solely for interfacing to external devices.


VCC; Pin 40 provides supply voltage to the chip. Write to external data memory.

The AT89C51 datasheet of the Microcontroller and more detailed Features can be found at the bottom of this page. In the there is only one data type: Now let us talk about this popular chip. All the registers of 89C51 are. When connecting an to external memory, port 0 provides micricontroller address and data. How to choose a Microcontroller?

They are addressed as 0 to in decimal or 00 to 7FH. Favourite Links Google Search Engine. Some baud rates are shown below: This Blog is made for beginners who wants to learn based Micro Controller.

Learn (For Beginners): AT89C51 Description

All come with on-chip ROM to store programs. For larger designs with external memory, it becomes a multiplexed address and data bus. This mode has many applications, including setting the baud rate in serial communication.

Virgin Galactic — Commercial Space Flight. Figure shows permanent connections of Reset Pin. Please give your valuable comments for further improvements. Starting from simple to advance interfacing techniques of various devices with Micro Controllers. What is Web Browser. Supply voltage; 5V up to 6. It counts up until it reaches its limit of FFH.

These registers can also be read like any other register. Except P 0 which needs external pull-ups, rest of the ports have internal pull-ups. Reset pin; Active high. Read from external data memory. That information could be a byte of data to be processed, or an address pointing to the data to be fetched. Submitted by webmaster on 14 May Answer Tips Double click any word to see the meaning. The low byte register is called TL0 timer 0 low byte and the high byte register is referred to as th0 timer 0 high byte.


If we are using timer 0, TF0 goes high; if we are using timer 1, TF1 is raised. It can be erased and program to a maximum of times. TL — Programmable Reference Voltage.

vatasheet Port 0 ; is a dual-purpose port on pins of agmel 1C. SPI Module of Arduino. Program pulse input during Flash programming. Similarly, when the bits are received serially via RxD, the 89C51 deframes it by eliminating the stop and start bits, making a byte out of the data received, and then placing it in the SBUF.

Set by hardware halfway through the stop bit time in mode1. SBUF can be accessed like any other register in the 89C All these ports are 8-bit bi-directional ports, i.