Atmel reserves the right to change devices or specifications detailed in this data book .. However, the Atmel AT89C51 and AT89C52 can be special ordered as . 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. AT89CPI Microchip Technology / Atmel 8-bit Microcontrollers – MCU UNSAWN WAFER 21 MIL BACKGRIND 89C51 – 24MHZ, PDIP, IND TEMP datasheet.

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These registers can also be read like any other register.

These registers are accessible in the same way as the registers of timer 0. It can be programmed to operate at different baud rates. Answer Tips Double click any word to see the meaning. Port P 0 and P 2 are also used to provide low byte and high byte addresses, respectively, when connected to an external memory. It must be emphasized that mode 2 is an 8-bit timer. TH is loaded with the initial count and a copy of it is given to TL.

Notice that in flash memory you must erase the entire contents of ROM in order to program it again. It has on chip ROM in the form of flash memory. This Blog is made for beginners who wants to learn based Micro Controller.

All the registers of 89C51 are. It counts up until it reaches its limit of FFH. Mode 2 Programming; The following are the characteristics and operations of mode 2. Low-order address bits when interfacing with external memory.


Output transmitter for serial communication. This reloading leaves TH unchanged, still holding a copy of original value. Port 0 ; is a dual-purpose port on pins of the 1C.

When connecting an to external memory, port 0 provides both address and data. Set by hardware at the beginning of the stop bit in mode1.

AT89C51 Microcontroller

With an 8-bit data type, any data larger than 8 bits must be broken into 8-bit chunks before it is processed. All of the above registers are 8-bits, except DPTR and the program counter.

AT89C51 is an 8-bit microcontroller and belongs to Atmel’s family. 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 such cases, the EA pin is connected to VCC for giving power to save and erase program from the memory. Program pulse input during Flash programming. PSEN; This is an output pin. Except P 0 which needs external shest, rest of the ports have internal pull-ups.

All the registers of 89C51 are; Timers; Both timer 0 and timer 1 are 16 bits wide.

ATMEL 89C51 | AT89C51 Microcontroller Pin Diagram & Description

Anonymous August 26, at 3: Subscribe via email New posts will be send to you via email Enter your email address: Choosing Motor For Robots. Registers; In the CPU, registers are used to store information temporarily. Interface GPS with Arduino. They are addressed as 0 to in decimal or 00 to 7FH. It can be erased and program to a maximum of times. This makes mode 2 and auto-reload, in contrast with mode 1 in which the programmer has to reload TH and TL.

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.


This is ideal for fast development since flash memory can be erased in seconds compared to the twenty minutes or more microcontdoller for the This erasing of flash is done by the PROM burner itself.

Could you pls upload them again? Supply voltage; 5V up to 6. All come with on-chip ROM to store programs. All these ports are 8-bit bi-directional ports, i. How to choose a Microcontroller? Port 3; is a dual — purpose port on pins These ports are also bit addressable and so their bits can also be accessed individually.

No alternate functions are as signed for Port 1 pins; thus they are used solely for interfacing to external devices. This is just like mode 1. This mode has many applications, including setting the baud rate in serial communication. GND; Pin 20 is the Ground pin.

Read from external data memory. High-order address bits when interfacing datx external memory.

AT89C51 Datasheet(PDF) – ATMEL Corporation

SPI Module of Arduino. Arduino based GPS receiver. In each case, the lower 2 bits are used to set the timer mode and the upper 2 bits to specify the operation. View my complete profile. The vast majority of 89C51 register an microcoontroller pointing to the data to be fetched.