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Figure 7.9 New addresses can be calculated and then loaded into the program counter via the PC latch and PCL registers.
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the explanation of the instruction sets for the other PIC microcontroller processor architectures, as the instruction operation may be identical to what has been explained previously.
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If you are familiar with the Intel 8086 (the base processor used in the IBM PC), you will probably appreciate the ability of some instructions to execute without having to store temporary results in the accumulator registers. This feature can signi cantly simplify applications as well as avoid the need for temporarily saving the contents of the accumulators. Unfortunately, the PIC microcontroller does not have this capability and data has to pass through WREG before it can be put in a destination register. The typical data ow for information in the PIC microcontroller is:
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w = Source; Destination = w; // // Load w with the Source Data Store the contents of w
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To load w, two primary instructions are used. The movlw instruction (see Fig. 7.10) loads w with an 8-bit constant value. The format of the instruction is:
movlw Constant ; Load w with Constant
This is the basic method of loading w with a constant value. None of the STATUS ags are changed by the movlw instruction. Using the InsTemplate.asm project that you set up at the start of the chapter, you can demonstrate the operation of the movlw instruction using the simple program (which replaces the statement ; Insert Code Here):
movlw 0x12 ; Load W Reg with Constant
Figure 7.10 into w.
The movlw instruction: load literal value
THE MID-RANGE INSTRUCTION SET
Step Into Icon
W Register Loaded with 0x12
Figure 7.11 The operation of the movlw instruction can be easily demonstrated using the MPLAB IDE simulator.
As has been discussed in this section, the movlw instruction simply loads an 8-bit constant value into WREG. After adding the line of code, build it by pressing Ctrl-F10 or clicking on Project and then Build All. Make sure that the MPLAB IDE Simulator is selected by clicking on Debugger, then Select Tool, and nally MPLAB Simulator. Single-step through the movlw instruction by clicking once on the Step Into icon on the top left toolbar of MPLAB IDE (as shown in Fig. 7.11). When you are done the arrow will be pointing to the goto $ instruction. Looking at Fig. 7.11, you will see that the WREG value in the Watch window changes to 0x12, but you should also notice that WREG contents are displayed on the toolbar at the bottom of the desktop. To load w with the contents of a register, the movf instruction (see Fig. 7.12) is used. The format of the movf instruction is:
movf Variable, d ; ; ; ; Move the contents of Variable through the ALU and set the Zero ag based on its value. Store Variable according to d which can be w or f
USING THE PIC MCU INSTRUCTION SET
Figure 7.12 The movf instruction: load WREG with the contents of a register operation.
where d is the destination of the contents of the variable and can be either 0 or 1. When you use the MPASM assembler, the values w or f can be used in place of 0 or 1, respectively. The w and f constants are declared in the device include le. If d is reset (w or 0), then the contents of Variable will be stored in WREG. If d is set (f or 1), then the value of Variable will pass through the PIC microcontroller s ALU, change the zero ag according to its value, and then be written back into Variable without changing the contents of WREG. I think of the movf instruction as being used to set the zero ag according to the contents of the register and optionally load w with the contents of the register. This may seem like a backward way of describing the instruction, but it is actually quite accurate in terms of how the instruction executes. To test the contents of a register, the ALU ORs the value read from the register with 0x000, which sets the zero ag if the result of this operation is zero. To demonstrate this operation, put in the following code into the InsTemplate.asm project:
movlw movwf movlw movwf movf movf 0x47 0x20 0x00 0x21 0x20, w 0x21, f ; Load a Register with non-Zero Constant
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