89C51/89C52/89C54/89C 80C51 8-bit microcontroller family. 4K/8K/16K/32K Flash. Product specification. Replaces Datasheets 89C51 of. 89C51 datasheet, 89C51 pdf, 89C51 data sheet, datasheet, data sheet, pdf, Atmel, 8 Bit Microcontroller with 4 Kbytes Flash. 89C51 89C51/89C52/89C54/89C58; 80C51 8-bit Microcontroller Family 4K/8K/ 16K/32K Flash. DESCRIPTION. The 89C51/89C52/89C54/89C58 contain a.

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TMOD is an 8-bit register in which the lower 4 bits are set aside for timer microcontrooller and the upper 4 bits are set aside for timer 1.

Notice that in flash memory you must erase the entire contents of ROM microcontro,ler order to program it again. It must be emphasized that mode 2 is an 8-bit timer. All come with on-chip ROM to store programs. In such cases, the EA pin is connected to VCC for giving power to save and erase program from the memory.

The low byte register is called TL0 timer 0 low byte 89c551 the high byte register is referred to as th0 timer 0 high byte.

For larger designs with external memory, it becomes a multiplexed address and data bus. What is Web Browser. 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. This is ideal for fast development since flash memory can be erased in seconds compared to the twenty minutes or more needed for the Interface GPS with Arduino. Similarly, when the bits are received serially via Mucrocontroller, 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.


Port 0 ; is a dual-purpose port on pins of the 1C. GND; Pin 20 is the Ground pin. TH is loaded with the initial count and a copy of it is given to TL.

This reloading leaves TH dstasheet, still holding a copy of original value. Quartz crystal oscillator up to 24 MHz. Port 3; is a dual — purpose port on pins Please give your valuable comments for further improvements.

All the registers of 89C51 are. Write to external data memory. Now coming to the other pin functions. In the there is only one data type: Learn For Microcontropler.

Posted by Fani at 4: This is just like mode 1. Must by cleared by software. View my complete profile.

Learn (For Beginners): AT89C51 Description

All of the above registers are 8-bits, except DPTR and the program counter. Set by hardware halfway through the stop bit time in mode1. AT89C51 is an 8-bit microcontroller and belongs to Atmel’s family. They are addressed as 0 to in decimal or 00 to 7FH. When this mcrocontroller is brought high for a least two machine cycles, the internal registers are loaded with appropriate values for an orderly system start-up.


No alternate functions are as signed for Port 1 pins; thus they are used solely for interfacing to external devices. It can be erased and program to a maximum of times. Must be cleared by software.

Atmel 89C51 Microcontroller

How to choose a Microcontroller? Timer 0 Register; The bit register of time 0 is accesses as low byte and high byte. Mode 2 Programming; The following are the characteristics and operations of mode 2.

Choosing Motor For Robots. Input receiver for serial communication.