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PIC 8 BIT AND 16 BIT MICROCONTROLLER ARCHITECTURE

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The architectures of various PIC microcontrollers can be divided as follows :


Low - end PIC Architectures

Mid-range PIC Architectures

CPU Architecture


FSR Register(file selection register,address=04H,84H)-FSR is an 8 bit register used as data memory address pointer. This is used in indirect addressing mode



INDF Register(INDirect through FSR,address=00H,80H)-INDF is not a physical register. Accessing INDF access is the location pointed to by FSR in indirect addressing mode



PIC 8 bit and 16 bit architecture features:


Harvard architecture.
Small number of fixed length instruction.
A hardware stack for storing return address.
Data spaced mapped CPU , port and periferal registers.


Limitations


Only one accumulator
Operations and registers are not orthogonal
Register bank switching is required
Software implemented stacks are not efficient


Conclusion


Thus PIC architecture offers-
Seamless migration
Pin compatibility
Code compatibility
Again it gives-
Flexibility
Maximise reuse for future developments