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PIC Microcontroller Architecture:

Advantages of PIC Microcontroller:

They are reliable and malfunctioning of PIC percentage is very less. And performance of the PIC is very fast

because of using RISC architecture.

Power conception is also very less when compared to other micro controllers. When we see in the programmer

point of view interfacing is very easy, also we can connect analog devices directly with out any extra circuitry

and use them. Programming is also very easy when compared to other microcontrollers.

Disadvantages of PIC Microcontroller:

The length of the program will be big because of using RISC (35 instructions).

Program memory is not accessible and only one single accumulator is present.

Ngun :http://www.electronicshub.org/pic-microcontroller-architecture/

Theo wiki :

Advantages[edit]

Small instruction set to learn

RISCarchitecture

Built in oscillator with selectable speeds

http://www.electronicshub.org/pic-microcontroller-architecture/http://www.electronicshub.org/pic-microcontroller-architecture/http://www.electronicshub.org/pic-microcontroller-architecture/http://en.wikipedia.org/w/index.php?title=PIC_microcontroller&action=edit&section=9http://en.wikipedia.org/w/index.php?title=PIC_microcontroller&action=edit&section=9http://en.wikipedia.org/w/index.php?title=PIC_microcontroller&action=edit&section=9http://en.wikipedia.org/wiki/Reduced_instruction_set_computerhttp://en.wikipedia.org/wiki/Reduced_instruction_set_computerhttp://www.electronicshub.org/wp-content/uploads/2013/09/PIC-Microcontroller-Architecture.pnghttp://en.wikipedia.org/wiki/Reduced_instruction_set_computerhttp://en.wikipedia.org/w/index.php?title=PIC_microcontroller&action=edit&section=9http://www.electronicshub.org/pic-microcontroller-architecture/

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Easy entry level, in-circuit programming plus in-circuit debuggingPICKitunits available for less than

$50

Inexpensive microcontrollers

Wide range of interfaces includingIC,SPI,USB,USART,A/D,programmable

comparators,PWM,LIN,CAN,PSP,and Ethernet

[9]

Availability of processors inDILpackage make them easy to handle for hobby use.

Limitations[edit]

Oneaccumulator

Register-bank switchingis required to access the entire RAM of many devices

Operations and registers are notorthogonal;some instructions can address RAM

and/orimmediateconstants, while others can use the accumulator only.

The following stack limitations have been addressed in the PIC18series, but still apply to earlier cores:

The hardware call stack is not addressable, so preemptivetask switchingcannot be implemented Software-implementedstacksare not efficient, so it is difficult to generatereentrantcode and

supportlocal variables

With paged program memory, there are two page sizes to worry about: one for CALL and GOTO and

another for computed GOTO (typically used for table lookups). For example, on PIC16, CALL and

GOTO have 11 bits of addressing, so the page size is 2048 instruction words. For computed GOTOs,

where you add to PCL, the page size is 256 instruction words. In both cases, the upper address bits are

provided by the PCLATH register. This register must be changed every time control transfers between

pages. PCLATH must also be preserved by any interrupt handler.[10]

Ngun :http://en.wikipedia.org/wiki/PIC_microcontroller

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