Microcontroller: Output and Pin

Topics: Output, Microcontroller, Central processing unit Pages: 3 (567 words) Published: July 28, 2010

A microcontroller (mcu or µc) is a small computer on a single integrated circuit consisting of a relatively simple CPU combined with support functions such as a crystal oscillator, timer, watchdog, I\O etc.

Microcontrollers are designated for small applications. Thus, in contrast to the microprocessors used in personal computers and other high performance applications, simplicity is emphasized. Microcontrollers operate at frequency as low as 12 MHz, as this is adequate for many typical applications, enabling low power consumption (mill watt or nanowatt).

Microcontroller is used in automatically controlled products and devices, such as automatic control system, appliances and toys.

| Microprocessors | Microcontroller | |1. It is just a CPU. |1.Include CPU+ I/O+ RAM+ROM+TIMERS+SERIAL COMM | | |On a single chip. | |2. Operates at high frequency ie, 2.06GHz. |2.Operates at a low frequency ie,12 MHz | |3. It is general purpose, i.e. more than on operation can be perform |3. It is single purpose ,i.e. can perform only one task at a time. | |simultaneously. | | |4.Costly |4. Cheap. |

Introduction to 8051 microcontroller

Input /Output pins 32

RAM 128 bytes

ROM 4K bytes

Timers 2

Interrupt sources 6

Serial port 1

Pin Diagram and Description

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