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0 3 INTCON, GIE FSR, f INDF, w SUBRTN_TEMP 3 INTCON, GIE FSR, f SUBRTN + TEMP, w
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; Read parm1
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The SUBRTN_TEMP variable is used to save the value read from the stack while the FSR is updated. For most changes in the FSR, simple increment and decrement instructions could be used instead and actually take fewer instructions and not require the temporary variable. The preceding code could be rewritten as
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While this code seems reasonably easy to work with, it does become a lot more complex as you add 16-bit variables and arrays. The PIC18 can be used effectively for passing parameters on a data stack created using the FSR register and the POSTDEC# (where # is the FSR register from 0 to 2), PREINC#, and PLUSW# INDF registers. These registers will maintain the stack for you automatically and allow you to access data placed on the stack directly. To call a subroutine with two parameters and one returned, the following instructions could be used (assuming that FSR0 is already set up to point to the data stack):
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This is just over half the number of instructions required for the call in low-end and mid-range devices. An even better improvement can be demonstrated reading param1, which is 3 bytes down from the top of the stack:
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SUBTRACTION, COMPARING AND NEGATION
In these instructions, the byte that was pushed down onto the stack with 2 bytes on top of it is accessed by adding three to the stack pointer and storing the value in the w register (destroying the offset to the byte put there earlier). This capability makes the PIC18 a very powerful architecture to work with and allows you and compiler writers to develop code that is similar to what is used on high-end processors. There is one method of passing parameters to and from that I haven t discussed because I do not believe that it is an appropriate method for the PIC microcontroller, and that is using the processor s registers to store parameters. For the PIC microcontroller, there is only the w register, which is 8 bits wide, that can be guaranteed for the task. To frustrate using this method, the low-end devices lack of a return instruction prevents passing data back using the w register except in the case of using the retlw instruction and a jump to a table offset. The zero, carry, and digit carry STATUS register ags also could be used for this purpose, and they are quite effective for being used as pass/fail return ags.
Subtraction, Comparing and Negation
This section was originally titled Working with the Architecture s Quirks because there are some unusual features about the architecture that make copying assembly-language applications directly from another microcontroller to the PIC microcontroller dif cult. However, as I started listing what I wanted to do in this and the following sections, I realized that there were many advantages to the PIC microcontroller s architecture and that many of the quirks actually allow very ef cient code to be written for different situations. In this and the following sections I will discuss how the PIC microcontroller architecture can be used to produce some code that is best described as funky. In addition, the basic operation sequence of adding two numbers together is
1 Load the accumulator with the rst additional RAM. 2 Add the second additional RAM to the contents of the accumulator. 3 Store the contents of the accumulator into the destination.
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