Microcontroller Basics:
Any electric appliance that stores, measures, displays information or calculates comprise of a microcontroller chip inside it. The basic structure of a microcontroller comprise of:-
Types of Microcontroller:
Microcontrollers are divided into categories according to their memory, architecture, bits and instruction sets. So let’s discuss types of microcontrollers:-
Bits:
8 bits microcontroller executes logic & arithmetic operations. Examples of 8 bits micro controller is Intel 8031/8051. 16 bits microcontroller executes with greater accuracy and performance in contrast to 8-bit. Example of 16 bit microcontroller is Intel 8096. 32 bits microcontroller is employed mainly in automatically controlled appliances such as office machines, implantable medical appliances, etc. It requires 32-bit instructions to carry out any logical or arithmetic function.
Memory:
External Memory Microcontroller – When an embedded structure is built with a microcontroller which does not comprise of all the functioning blocks existing on a chip it is named as external memory microcontroller. For illustration- 8031 microcontroller does not have program memory on the chip. Embedded Memory Microcontroller – When an embedded structure is built with a microcontroller which comprise of all the functioning blocks existing on a chip it is named as embedded memory microcontroller. For illustration- 8051 microcontroller has all program & data memory, counters & timers, interrupts, I/O ports and therefore its embedded memory microcontroller.
Instruction Set:
CISC- CISC means complex instruction set computer, it allows the user to apply 1 instruction as an alternative to many simple instructions. RISC- RISC means Reduced Instruction Set Computers. RISC reduces the operation time by shortening the clock cycle per instruction.
Memory Architecture:
Harvard Memory Architecture Microcontroller Princeton Memory Architecture Microcontroller
8051 Microcontroller:
The most universally employed set of microcontrollers come from the 8051 family. 8051 Microcontrollers persist to be an ideal choice for a huge group of hobbyists and experts. In the course of 8051, the humankind became eyewitness to the most ground-breaking set of microcontrollers. The original 8051 microcontroller was initially invented by Intel. The two other members of this 8051 family are-
8052 – This microcontroller has 3 timers & 256 bytes of RAM. Additionally it has all the features of the traditional 8051 microcontroller. 8051 microcontroller is a subset of 8052 microcontroller. 8031 – This microcontroller is ROM less, other than that it has all the features of a traditional 8051 microcontroller. For execution an external ROM of size 64K bytes can be added to its chip.
8051 microcontroller brings into play 2 different sorts of memory such as- NV-RAM, UV-EPROM and Flash.
8051 Microcontroller Architecture:
8051 microcontroller is an eight bit microcontroller launched in the year 1981 by Intel Corporation. It is available in 40 pin DIP (dual inline package). It has 4kb of ROM (on-chip programmable space) and 128 bytes of RAM space which is inbuilt, if desired 64KB of external memory can be interfaced with the microcontroller. There are four parallel 8 bits ports which are easily programmable as well as addressable. An on-chip crystal oscillator is integrated in the microcontroller which has crystal frequency of 12MHz. In the microcontroller there is a serial input/output port which has 2 pins. Two timers of 16 bits are also incorporated in it; these timers can be employed as timer for internal functioning as well as counter for external functioning. The microcontroller comprise of 5 interrupt sources namely- Serial Port Interrupt, Timer Interrupt 1, External Interrupt 0, Timer Interrupt 0, External Interrupt 1. The programming mode of this micro-controller includes GPRs (general purpose registers), SFRs (special function registers) and SPRs (special purpose registers).
PIC Microcontroller:
Peripheral Interface Controller (PIC) provided by Micro-chip Technology to categorize its solitary chip microcontrollers. These appliances have been extremely successful in 8 bit micro-controllers. The foremost cause behind it is that Micro-chip Technology has been constantly upgrading the appliance architecture and included much required peripherals to the micro-controller to go well with clientele necessities. PIC microcontrollers are very popular amid hobbyists and industrialists; this is only cause of wide availability, low cost, large user base & serial programming capability.
PIC Microcontroller Architecture:
The architecture of the 8 bit PIC microcontrollers can be categorized as below –
AVR Microcontroller:
AVR also known as Advanced Virtual RISC, is a customized Harvard architecture 8 bit RISC solitary chip micro-controller. It was invented in the year 1966 by Atmel. Harvard architecture signifies that program & data are amassed in different spaces and are used simultaneously. It was one of the foremost micro-controller families to employ on-chip flash memory basically for storing program, as contrasting to one time programmable EPROM, EEPROM or ROM, utilized by other micro-controllers at the same time. Flash memory is a non-volatile (constant on power down) programmable memory.
AVR Microcontroller Architecture:
AVR microcontrollers’ architecture was developed by Alf-Egil Bogen and Vegard Wollan. The name AVR is derived from the names of the architecture developers of the microcontroller. The AT90S8515 was the foremost micro-controller which was AVR architecture based; on the other hand the foremost micro-controller to strike the commercial marketplace was AT90S1200 which was launched in the year 1997. The SRAM, Flash and EEPROM all are incorporated on a single chip, thereby eliminating the requirement of any other external memory in maximum devices. Several appliances comprise of parallel external bus alternative, so as to add extra data memory gadgets. Approximately all appliances, except TinyAVR chips comprise serial interface, which is used to link large serial Flash & EEPROMs chips.
ARM Microcontroller:
ARM is the name of a company that designs micro-processors architecture. It is also engaged in licensing them to the producers who fabricate genuine chips. In actuality ARM is a 32 bit genuine RISC architecture. It was initially developed in the year 1980 by Acorn Computers Ltd. This ARM base microprocessor does not have on-board flash memory. ARM is particularly designed for micro-controller devices, it is simple to be trained and make use of, however powerful enough for the most challenging embedded devices.
ARM Microcontroller Architecture:
The ARM architecture is a 32 bit RISC processor developed by ARM Ltd. Owing to its power-saving attributes, ARM central processing units are prevailing in the mobile electronics marketplace, where less power expenditure is a vital design aim. ARM architecture comprise of the underneath RISC elements:-
Maximum single cycle functioning Constant 16×32 bit register file. Load or store architecture. Preset instruction width of 32 bits so as to simplify pipe-lining and decoding, at minimized code density. For misaligned memory access there is no support.
Microcontroller Applications:
Microcontrollers are intended for embedded devices, in comparison to the micro-processors which are used in PCs or other all-purpose devices. Microcontrollers are employed in automatically managed inventions and appliances like- power tools, implantable medical devices, automobile engine control systems, , office machines, remote controls appliances, toys and many more embedded systems. By dipping the size and expenditure in comparison to a design that make use of a different micro-processor, I/O devices and memory, micro-controllers formulate it inexpensive to digitally control more & more appliances and operations. Mixed signal micro-controllers are general; putting together analog constituents required controlling non-digital electronic structures.
Application of Microcontroller in Day to Day Life Devices:
Light sensing & controlling devices Temperature sensing and controlling devices Fire detection & safety devices Industrial instrumentation devices Process control devices
Application of Microcontroller in Industrial Control Devices:
Industrial instrumentation devices Process control devices
Application of Microcontroller in Metering & Measurement Devices:
Volt Meter Measuring revolving objects Current meter Hand-held metering systems
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