Microcontrollers Features Essay Sample

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This is an 8-bit chip microcontroller that has been improved from the 87C51FA. Its features make it a powerful microcontroller, which is ideal for applications such as pulse width modulation, high-speed I/O and up/down counting capabilities.

The suitable application for 87C51FB microcontroller would be windshield wiper system, because of its adequate program memory and RAM. It has on board Program Array Counter (PCA), which enables it to capture input and output pulse width modulation. The input capture feature is needed in order for pulse width measurement to work with capacitive sensors (used to detect rain on the windshield). The 87C51FB offers a controlled variable speed of the wipers.

The Features:

> 12 MHz Operation

> Three 16-bit Timer/Counters

> 7 Interrupt Sources, with 4-level interrupt priority

> Programmable Counter Array (PCA)

Input Capture/Compare

Pulse Width Modulator

High Speed Output

> 32K bytes EPROM, 256 bytes RAM

> 32 Programmable Input/Output Lines (Four 8-bit I/O Ports)

87LPC767 microcontroller

The 87LPC767 is a 20-pin single-chip microcontroller; it is intended for low system cost applications, with a low pin count, that demand high integration. This microcontroller has its relations within the Philips low-pin count family. The 87LPC767 is ideal for applications that contain sensors

The applications best suited for 87LPC767 microcontroller is a remote control transmitter unit.

The Features:

> 8 keypad interrupt inputs.

> Programmable port output configuration options: quasibidirectional, open drain, push-pull, input only.

> Two 16-bit counter/timers. Each timer can be configured to toggle a port output upon timer overflow.

> LED drive capability(20 mA) on all port pins.

> Watchdog timer with separate on-chip oscillator, requiring no external components

68HC11 microcontroller

The 68HC11 is a microcontroller made by Motorola, it’s powerful with an 8-bit data, 16-bit address and an instruction set, Timers, RAM EEPROM/OTPROM digital I/O, A/D converter PWM generator, and synchronous and asynchronous communication channels (RS232 and SPI) are built into the 68HC11 microcontroller.

The application best suited for 68HC11 microcontroller is an emergency communicator system application because it

– Records a set of personalised emergency messages.

– Dial customised telephone number(s) when triggered by a pushbutton, monitor, sensors etc.

– Monitor call status and delivers recorded massages.

The Features:

> Power saving STOP and WAIT modes

> Synchronous Serial Peripheral Interface (SPI)

> 8-channel 8-bit Analog-to-digital (A/D) converter

> HCMOS

> EEPROM

> Clock monitor

> Parallel input/output

> Highest priority interrupt

> 16-bit Timer system

Features applied to the emergency communicator system

> HCMOS

Low power – operates on battery backup

Noise immunity – operates in surroundings with telephone line and (possibly) radio transmitters

> EEPROM

Calibration table -look up values for dial tones, ring back signals, busy signals etc.

User parameters – a list of telephone numbers to call in a case of different emergencies

System configuration – the locality of the emergency message “phrases” in memory

> Analog-to-digital converter

Convert voice input to digital for recording message phrases

> Serial peripheral interface

Transmission of serial ASCII data to an LCD display unit for the user interface

> Timer subsystem

Input capture functions in order to measure the signals on the telephone line to supervise the call status.

Real-time interrupt will display the time since call request

> Parallel input/output

Manage input and output (simple mode)

External memory interface

> STOP and WAIT modes

Minimise power usage when the unit is idle

> Clock monitor

Whilst the system is in the WAIT mode, the clock monitor will confirm that the correct operations is taking place, and if any errors are detected it can reset the system.

> Highest priority interrupt

IRQ is elevated to the highest priority as this shows a request for an emergency message

80251 microcontrollers

This is first 8051 microcontroller families, and still is one of the most commonly used, these are relatively cheap, encompass decent tools, and also presents a good possibility of upgrading to larger and more capable parts.

Intel is the first company that is responsible for the 8051 family, other companies has taken up the idea and largely produces these microcontrollers, such as Atmel, Dallas Semiconductors, and Philips

The suitable application for 80251 microcontrollers would be a cellular phone application. Because of the features it has which is similar to a cellular phone:

> UART (Universal Asynchronous Receiver Transmitter)

To transfer data, to and from the serial port

> Watchdog Timer

To reset processor after a specified interval when activated, and provides a means of gracefully recovering from system problems

> Interrupt Handler

To provide a means of interrupt polling and handle real-time interrupt that may occur.

> Power Monitoring and Management

This mode is very useful in terms of reducing power consumption when the processor is idle.

> SPI (Serial Protocol Interface)

This is a protocol for wireless connectivity

> Wire (Synchronous Serial Interface)

for interfacing to microcontroller

The Features:

> UART (Universal Asynchronous Receiver Transmitter)

> Watchdog Timer

> SPI (Serial Protocol Interface)

> Interrupt handler

> Wire (Synchronous Serial Interface)

> Power Monitoring and Management

> ROM

REFERENCES

www.semiconductors.philips.com

www.motorola.com

www.intel.com

http://www.atmel-wm.com

http://www.cs.unc.edu/~vicci/comp261/project/mcu/80251_prog_man.pdf

www.bitbus.com

www.microbus.com

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