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The important data is often called the context data or context information, and consists of the contents of the registers that were being used by the mainline code when it was interrupted This context information may be saved automatically by the processor or require special code to save and retrieve it The PIC microcontroller requires special code to save and retrieve the context data With the return address saved, the processor then changes the program counter to the interrupt handler vector (3 in Fig 18) The interrupt handler (4 in Fig 18) is the subroutine-like code that processes the data from the interrupting hardware and stores it for later use You may see terms like interrupt service routine in some references instead of interrupt handler, but they both mean the same thing..

Relatively speaking, the PIC microcontroller does not have a very wide range of instructions that algorithmically or logically change data values. The 7 unique operations (implemented over 15 instructions) available in the PIC microcontroller may not seem to be that comprehensive, but they provide all the basic arithmetic operations needed to implement virtually any application. As I work through the different operations, I will show some simple optimizations and tricks that will help you with your applications as well as explain exactly how the instructions work. Throughout the book, I will be presenting you with algorithms and snippets that will allow you to implement very sophisticated applications, despite the limited number of data processing instructions. The arithmetic operation that probably comes to mind rst is addition. In the PIC microcontroller, addition is carried out in a very straightforward manner, with the contents of the register speci ed by the addwf instruction added to the contents of w and the result stored in either the speci ed register or w. The operation of addwf is shown in Fig. 7.23.

If you re traveling to give your presentation, pack a hard copy of your material, your notes, a ash drive, and any props or handouts in your carry-on luggage.

The format used for the addwf instruction is:

Equations (9.4), (9.6), and (9.7) contain four expressions with four They can be solved simultaneously unknowns, Q, AT,,, TH2, and Tm.

where Register contains the value to be added to the contents of w. The STATUS register operation bits (carry, digit carry, and zero) are reset or set according to the result of the addition operation as described next. addlw (Fig. 7.24) is used to add an immediate (Constant) value to the contents of WREG with the result being stored back into WREG. The source code format for the instruction is:

As I have indicated in the previous instruction, all the STATUS register operation bits are affected by the addition and subtraction instructions. The zero ag is set if the result ANDed with 0x0FF is equal to zero. The carry ag is set if the result is greater than 0x0FF (255). The digit carry ag is set when the sum of the least signi cant 4 bits is greater than 0xF (15). For example, if you had the code:

at the end of execution, WREG would contain 20 (or 0x14), Reg have 10 (0xA), the zero and carry ags would be reset (equal to zero), and the digit carry ag would be set because the sum of the least signi cant 4 bits was greater than 15 (0xF). I would suggest that you try out the three instructions above, along with three additional instructions, which should set the carry ag and none of the other STATUS register ags:

movlw movwf addwf movlw movwf addwf 10 0x20 0x20, w 160 0x20 0x20, w ; ; ; ; Add 0x0A to 0x0A Put the Result in w /Set DC Flag Add 0xA0 to 0xA0 Put the result in w /Set C Flag