PIC16FA Flash pin 4MHz 8kB Microcontroller Datasheet and Technical Data. Note: The datasheet of PIC16FA Microcontroller and more detailed Features can be found at the bottom of this page. PIC16F87XA 28/40/Pin Enhanced Flash Microcontrollers Devices Included in this Data Sheet: • PIC16FA • PIC16FA • PIC16FA • PIC16FA.

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Once the processor is reset and ready to go, the program counter, which is simply 16f877x counter that acts datashdet a pointer to the program instructions points to the initial location of the program memory.

A detailed explanation if the instruction set will follow later on in the tutorial, but for easy understanding of many of the concepts, it is advised to thoroughly go through the instruction set summary given in section 15 of the datasheet 6pages before proceeding further.

datasheey If notthis is the point of time to do so. For example, the instruction movlw 0xff will be encoded as 11 when stored in the PIC 16fa program memory. A refresher of new C coding features included in C99 and C11 for embedded system developers.

This crystal can be up to a maximum speed of 20Mhz. Again, the immediate next PC 08 is pushed into the stack. If the assembly or some other relevant files like libraries that are to be added to the project already exist, then add it here. The task of the execution unit, in simple words, is to fetch the instructions pointed to by the program counter PCdatashdet it Decode and execute it. This is like manually providing the execution cycle clock for each instruction.


The concept is from processor architecture, since the external memory access which will be much slower can be a bottleneck to the high speed operations within the processor. The execution unit fetches the program instruction in this first location. A micro-controller, in simple words, is a miniature computer with a central processing unit and some peripherals integrated into a single integrated circuit package.

When studying any electronic device or part, the bible is its datasheet. The IDE is an environment which integrates different simulation tools and compilers to provide datasheef single window solution to development and debugging. If operations are carried out one after another, the entire task to complete two sets of laundry takes 2 hours.

This gives rise to the a major classifications in processor architecture as. The clocking datashest derived from the crystal is internally divided by four.

But corresponding lines will have to be added at the reset vector 0x00 for successful execution. All the data manipulation and operations that are done within datassheet microcontroller ultimately manifests as output signals through the ports. It was further migrated to wordpress and then this page.

It will be 16f787a binary number that has encoded information relevant to the instruction. The green arrow shows the current execution that has been decoded and ready for execution.


The decrement operation takes one execution cycle per operation. Scratch pad memory registers are high speed memory registers which are integral to the processing center architecture.

This is done by switching on the corresponding port pin.

Two values stored in file register locations 0x20 and 0x21 are to be added and the result stored in register 0x The second form is easier to understand and manipulate from a programmers point of view. The working register, commonly referred to as the W reg, is the only scratchpad memory register accessible to the user in the PIC 16Fa.

PIC16FA – Microcontrollers and Processors – Microcontrollers and Processors

A simulator is a software that simulates the working 16f877 the device in detail. The temperature sensors measure the room temperature and gives it as input to the microcontroller through the ports. PIC 16Fa is a mid range microcontroller from microchip inc. This is where we will be entering our code.


The functionality is somewhat self explanatory 3 level cascade of the previous delay loop. After the first program, we are now all set to try out more interesting stuff.

Along with the data holding port registers, there is a darasheet of configuration registers associated with the ports. This will add the following screen to the workspace.