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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When connecting an to external memory, port 0 provides both microconrroller and data. Interface GPS with Arduino. Arduino based GPS receiver. Program pulse input during Flash programming.

ATMEL 89C51 | AT89C51 Microcontroller Pin Diagram & Description

The accumulator, register A, is used for all arithmetic and logic instructions. The vast majority of 89C51 registers are 8-bit registers.

VCC; Pin 40 provides supply voltage to the chip. For this reason the AT89C51 is used in place of the to eliminate the waiting time needed to erase the chip and thereby speed up the development time. Then the timer must be started. That information could be a byte of data to be processed, or an address pointing to the data to be fetched. They are addressed as 0 to in decimal or 00 to 7FH. How to choose a Microcontroller? The rest must be accessed in byte format.


Atmel AT89C51

Their collection has just piled up after Microchip has acquired Atmel. Set by hardware halfway through the stop bit time in mode1.

Output transmitter for serial communication. Posted by Fani at 4: SBUF can be accessed like any other register in the 89C All of the above registers are 8-bits, except DPTR and the program counter. If we are using timer 0, TF0 goes high; if we are using timer 1, TF1 is raised. Skip to main content. Must be cleared by software. One side of each capacitor is connected to the ground as shown in this figure.

However, your links for the tutorials no longer work. Answer Tips Double click any word to see the meaning. Anonymous August 26, at 3: Figure shows permanent connections of Reset Pin. Atmel microcontroller can be programmed with different software’s that is available in the market.

AT89C51 Microcontroller Pinout, Features & Datasheet

AT89C51 is an 8-bit microcontroller and belongs to Atmel’s family. However, it has an auto-reloading capability in auto reload. PSEN; This is an output pin.


The vast majority of 89C51 register an address pointing to the data to be fetched. This makes mode 2 and auto-reload, in contrast with mode 1 in which the programmer has to dafasheet TH and TL.

Instead the new AT89S51 is recommended for new applications. Set by hardware at the beginning of the stop bit in mode1. Submitted by webmaster on 14 May This is just like mode 1. All the registers of 89C51 are; Timers; Both timer 0 and timer 1 are 16 bits wide.

If you are planning on serious programming and expansion with community support then Keil is recommended.

With an 8-bit data type, any data larger than 8 bits must be broken into 8-bit chunks before it is processed. Input receiver for serial communication.

Choosing Battery for Robots. Choosing Motor For Robots. Write to external data memory.