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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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The accumulator, register A, is used for all arithmetic and logic instructions. When connecting an to external memory, port 0 provides both address and data. Then the timer must be started.

However, it has an auto-reloading capability in auto reload. Instead the new AT89S51 is recommended for new applications. That microcontrlller could be a byte of data to be processed, or an address pointing to the data to be fetched. All come with on-chip ROM to store programs.

Supply voltage; 5V up to 6. The low byte register is called TL0 timer 0 microconhroller byte and the high byte register is referred to as th0 timer 0 high byte. It counts up until it reaches its limit of FFH.


AT89C51 Microcontroller

Well this Blog is my small effort for helping beginners to understand the micro controllers. It is a 40 pin IC package with 4Kb flash memory. Notice that in flash memory you must erase the entire contents of ROM in order to program it again.

Favourite Links Google Search Engine. Submitted by webmaster on 14 May Now let us talk about this popular chip.

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

Read from external data memory. No alternate functions are as signed for Port 1 pins; thus they are used solely for interfacing to external devices. Some baud rates are shown below: Programming enable voltage; 12V during Flash programming.

These registers are accessible in the same way as the registers of timer 0.

Since the 89C51 has an 8-bit architecture, each bit timer is accessed as two separate registers of low byte and high byte. Anonymous August 26, at 3: The vast majority of 89C51 registers are 8-bit registers.

But, since the AT89C51 has a strong community support if your motive is to learn embedded then AT89C51 can still be a good choice. SBUF can be accessed like any other register in the 89C All the registers of 89C51 are. 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. SPI Module of Arduino. Program pulse input during Flash programming.


AT89C51 is an 8-bit microcontroller and belongs to Atmel’s family. TH is loaded with the initial count and a copy of it is given to TL. To repeat the process, we must simply clear TF and let it go without any need by the programmer to reload the original value. High-order address bits when interfacing with external memory. Each MCU has its own advantage and disadvantage. Newer Post Older Post Home. Could you pls upload them again?

Posted by Fani at dagasheet Choosing Motor For Robots. The AT89C51 datasheet of the Microcontroller and more detailed Features can be found at the bottom of this page.

All these ports are 8-bit bi-directional ports, i. Also simulating you program on software before trying it on hardware will save a lot of time. This is just like mode 1. However, your links for the tutorials no longer work. Subscribe via email New posts will be send to you via email Enter your email address: