What is 89c51 and 89c52?

8051(89c51,89c52) series microcontrollers have two build in timers, Timer-0 and Timer-1. You can use them as counters, event counters. They can also be used as interrupt counters. Both the 8051 microcontroller timers 0 and 1 are 16-bit wide.

What is AT89S51 microcontroller?

The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of In-System Programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the indus- try-standard 80C51 instruction set and pinout.

What is the difference between 8051 and AT89C51?

Basically the difference is that 8051 is the original one, 89C51 is one of the many 8051 family. If you are starting a new product, I strongly recommend you to use 89C51 (Atmel) or 89V51(NXP). Very easy to program (ISP), don’t need external EPROM. Regards.

What is timer and counter in 8051?

The 8051 has two counters/timers which can be used either as timer to generate a time delay or as counter to count events happening outside the microcontroller. Both timers are 16 bits wide. Since the 8051 has an 8-bit architecture, each 16-bit is accessed as two separate registers of low byte and high byte.

What is the IOL of microcontroller?

Iol stands for current, output low. Currents are traditionally referenced as going into a pin. If the output is high, the current flows out, so it is given a negative number. In some microcontrollers the maximum sink and source current limits for a given pin might be different.

How many interrupt pins are present in at89s52?

It has 32 I/O pins comprising of three 16-bit timers, external interrupts, full-duplex serial port, on-chip oscillator and clock circuitry.

What is the difference between timers and counters?

A timer is a specialized type of clock which is used to measure time intervals. A counter is a device that stores (and sometimes displays) the number of times a particular event or process occurred, with respect to a clock signal. It is used to count the events happening outside the microcontroller.

How many types of timers are there?

Timers can be categorized into two main types. A timer which counts upwards from zero for measuring elapsed time is often called a stopwatch, while a device which counts down from a specified time interval is more usually called a timer. A simple example of this type is an hourglass.

What is 8051 microcontroller board?

8051 Development Board is proposed to smooth the progress of developing and debugging of various designs encompassing Microcontrollers from Atmel, NXP and Dallas. It’s designed to facilitate On-board Programmer for NXP and Dallas Microcontroller through ISP on the serial port.

What is the difference between 8051 and 8052?

8052 is the super set of 8051 as it has all the features of 8051 with an extra timer and an extra RAM of 128 bytes. Therefore, 8052 has a total of 256 bytes of RAM and 3 timers in all. Also all the programs written for 8051 will run on 8052 as 8052 is super set of 8051, but it’s reverse is not true.

How many IO pins are available in AT89S52?

AT89S52 Microcontroller Introduction The chip can work in two power selectable operating modes. This device offers 32 GPIO pins which can be used as digital input-output pins or also same pins can be used for alternate functions.

What’s the difference between the 8051 and the AT89C51?

The only difference between the original 8051’s architecture and the AT89c51’s architecture is that the latter has 4KB of on-chip programmable flash memory. This allows for faster development since the flash memory can be erased in a few seconds.

What are the features of the at89s51 microcontroller?

The AT89S51 provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, two 16-bit timer/counters, a five- vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry.

What is the ale pin on the AT89C51?

In AT89C51, the lower 8 bits of the 16-bit address bus are multiplexed with the data bus. To separate these 8 bits, the ALE pin is kept high. It is an output pin that is used when we are connecting to external extra memory chips. stands for Program Pulse Input and is used when we are programming the flash memory of the AT89C51.

How does the at89s51 read from external memory?

PSEN Program Store Enable (PSEN) is the read strobe to external program memory. When the AT89S51 is executing code from external program memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory.