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;--- Register Files INDF TMR0 PCL STATUS FSR OSCCAL GPIO EQU EQU EQU EQU EQU EQU EQU H 0000 H 0001 H 0002 H 0003 H 0004 H 0005 H 0006
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;=============================================================== ; ; RAM De nition ; ;=============================================================== __MAXRAM H 1F ;=============================================================== ; ; Con guration Bits ; ;===============================================================
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At the start of the le, the PIC microcontroller speci ed within MPLAB is checked against the le to make sure they match. When MPLAB has a PIC microcontroller selected, the part number label with two underscore characters (__) is de ned when the assembler is invoked. For the PIC12C508, this label is __12C508, for the PIC16F84, it is __16F84, and so on. This label can be used in conditionally assembled code to access hardware appropriately instead of having to de ne multiple source les for different devices. Once the PIC microcontroller type is veri ed, then the hardware register addresses (under Register Files) are de ned. The registers are given the same labels as the Microchip documentation and have their addresses speci ed with them. Following the hardware register address de nitions, the bit de nitions for hardware registers that have unique, accessible bits are de ned. After the hardware register les are de ned, then the le registers are de ned. The __MAXRAM and __BADRAM directives are used to indicate the valid addresses for variables. One thing lacking with these directives is that the addresses are not given labels (a label indicating the start of the le registers would be useful) and the registers shadowed across banks are not de ned. This information could make application development somewhat easier and avoid the necessity of looking up the le register address ranges from the data books. Lastly, the con guration fuse bits are de ned. When I start working with a new PIC microcontroller, one of the rst things I always do is to open up the .inc le and look at the con guration fuses. As I will discuss in other areas of the book, a very common mistake is to forget one of the con guration fuse options, which causes your PIC microcontroller application to not work as expected. I want to make sure I access each con guration fuse option, either enabling or disabling it to make sure I don t have any unexpected problems. The .inc values are de ned with the NOLIST parameter speci ed. This means the actual de nitions will not be seen in the listing le, but will show up in the symbol table at the end of the listing le. Compiler include les can provide the same register and address information for an application as the assembly language .inc les and they can also be used to de ne language functions and features. When you are working with C, to properly access speci c library subroutines and functions there are include les that provide function prototypes, constants, and structures required for proper operation of the language.
MICROCHIP MPLAB IDE
In early versions of MPLAB IDE, when the tool is invoked and a project is loaded with a source le in the editor, a .$$$ le is created. This le contains the source code before any changes by the MPLAB editor. Typically this le is not required unless the source is corrupted in some way (which often means that you have done something you didn t mean to). This is the same for the .bkx le, which is a backup of the hex le created by MPLAB for the project when it was invoked previously. This le is no longer produced, so it is up to you to ensure that the source le is created correctly. One of the outputs of the assembler or compiler is the object (.o) le, which is a conversion of the source code statements into assembly code but without the full address information. When the application is linked together, the various object les are attached using the .lkr le, which is produced manually or by the Project Wizard in MPLAB IDE. The object le contains reference information for other object les if label addresses and data objects are local to it or null pointers to addresses and objects if they are external to the object le. The only time the object le will have all the correct references is if the application is written in assembler and there are no references to other object les or libraries. The listing (.lst) le is another output of the assembler or compiler. Its purpose is to provide error messages where they are encountered in the text, show expanded de nes as well as macros, and, if possible, show instruction and list label addresses. Addresses are generally only possible with single assembly source code projects. The following listing le was taken from one of the experiments from the second edition and shows the elements of the listing le. I will go through them to explain what is being displayed. To make the le easier to read, I have truncated the lines to the end of the page and deleted anything that would be wrapped around to the next line. As well, I have taken away the page breaks (except for the one at the start of the application) in order to save space in the book.
MPASM 02.30 Released PAGE 1 LOC OBJECT CODE VALUE LINE SOURCE TEXT ADC.ASM 12-27-1999 14:26:06
00001 title ADC - Reading a Resistor Value with 00002 ; 00003 ; This Program Uses the ADC built into a 00004 ; Reads an ADC Value and displays it on 00005 ; 00006 ; Hardware Notes: 00007 ; PIC16C711 running at 4 MHz 00008 ; Reset is tied directly to Vcc and PWRT is 00009 ; A 10K Pot Wired as a Voltage Divider on 00010 ; A 220 Ohm Resistor and LED is attached to 00011 ; 00012 ; Myke Predko 00013 ; 99.12.27 00014 ; 00015 LIST P=16C711, R=DEC
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