Select the Correct Microcontroller

 

Select the Correct Microcontroller

3. Bit Sizes

A microcontroller cannister either be 8bits, 16bits, 32bits and 64bits that is the present day maximum bit length possessed by using a microcontroller. The bit scope of a microcontroller represents the scale of a “phrase” used inside the training set of the microcontroller. This means in a eight-bit microcontroller, the representation of each coaching, deal with, variable or check in takes eight-bit. One of the key insinuations of the bit length is the memory capacity of the microcontroller. In an 8-bit microcontroller for instance, there are 255 particular reminiscence locations as dictated with the aid of the bit size even as in a 32-bit microcontroller, there are 4,294,967,295 specific memory locations, which means that the higher the bit size, the higher the variety of particular reminiscence locations to be had for use on the microcontroller. Manufacturers nowadays however, are growing ways to provide get entry to to extra memory location to smaller bit length microcontrollers through paging and addressing, in order that 8bits microcontroller come to be 16bits addressable but this has a tendency to complicate programming for the  embedded software developer.

The effect of bit size might be greater significantly skilled when developing the firmware for the microcontroller especially for mathematics operations. The numerous information types have one of a kind reminiscence length for one-of-a-kind microcontroller bit size. For example, the use of a variable declared as an unsigned integer which due to the information kind will require 16bits of reminiscence, in codes to be achieved on an 8bit microcontroller will result in the loss of the most tremendous byte in the records which at instances may be very essential to the fulfillment of the undertaking for which the tool on which the microcontroller is for use, changed into designed.

It is as a result crucial to pick a microcontroller with a chunk length that fits that of the records to be processed.

It is probably essential to note that maximum application nowadays are between 32bits and 16 bits microcontrollers due to the technological improvements included on these chips.

4. Interfaces for Communication

Communication among the microcontroller and some of the sensors and actuators to be able to be used for the project would possibly require the usage of an interface between the microcontroller and the sensor or actuator to facilitate the communications. Take as an instance to attach an analog sensor to a microcontroller would require that the microcontroller has sufficient ADC (analog to virtual converters) or as I referred to in advance, various the velocity of a DC motor may also require the usage of PWM interface at the microcontroller. So it will be important to verify that the microcontroller to be decided on has sufficient of the interfaces required which include UART, SPI, I2C amongst others.

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