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Hardware Notes: PIC16F684 running at 4 MHz Using the Internal Clock Internal Reset is Used RC0 - LED Control
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Myke Predko 07.04.01
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LIST R=DEC INCLUDE __CONFIG _FCMEN_OFF & _IESO_OFF & _BOD_OFF & _CPD_OFF & _CP_OFF & _MCLRE_ON & _PWRTE_ON & _WDT_OFF & _INTOSCIO ; Variables CBLOCK 0x20 Dlay:2 ENDC PAGE Mainline 0 ; PORTC 7 CMCON0 STATUS, ANSEL ^ TRISC ^ STATUS, ; ; RP0 0x080 0x080, 0 RP0 ; ; ; ; ; ; ; ; ; ; ; ; For ICD Debug Initialize I/O Bit to Off Turn off Comparators Execute out of Bank 1 All Bits are Digital Return Execution to Bank 0 Return Here after D0 Toggle High 8 Bits for Delay Low 8 Bits for Delay Three Cycle Delay Decrement the Inside Loop Skip if Zero Flag is Set Else, Loop Again Decrement the High Byte Until It Equals Zero
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org nop clrf movlw movwf bsf clrf bcf bcf
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Loop: clrf clrf DlayLoop: goto nop movlw subwf btfss goto decf btfss goto
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Dlay + 1 Dlay $ + 1 1 Dlay, f STATUS, Z DlayLoop Dlay + 1, f STATUS, Z DlayLoop
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1 PORTC, f Loop
Toggle RC0
A project was created for this application in exactly the same fashion as the C program (but with MPASM selected as the build tool) and was programmed exactly the same way and when I nished, the chip just sat there and did not execute the same way the C version did. After a bit of experimenting, I decided to remove the MPLAB ICD 2 and power the application circuit from the three AA batteries to see what would happen. The LED started ashing. It seems that the MPLAB ICD 2 s MCLR# driver did not go to a high impedance state, like it did in the PICC-Lite version of the application. I m mentioning this because you should remember that the hardware will not always work in exactly the same way for different projects and software build tools.
When Microchip published the datasheets and other technical information on their midrange products, they took the unusual (for the time) step of publishing the programming specifications without requiring a nondisclosure agreement (NDA). The programming interface and connections, which are now known as ICSP (for in-circuit serial programming), are quite simple and can be implemented easily with standard personal computer interfaces. With this information available, many hobbyists (as well as smaller programmer vendors) started producing programmer designs that allowed students, other hobbyists, and professionals to buy or create their own PIC microcontroller development tools for modest amounts of money. Along with allowing others to develop programmers for their parts, Microchip was also one of the rst manufacturers to incorporate electrically erasable programmable read-only memory (EEPROM, as well as Flash memory which is related to EEPROM) for program memory that does not require windowed ceramic packages, and UV erasers to erase the chips so new programs can be loaded into them. This strategy made the PIC microcontroller the choice of many people getting into microcontrollers for the rst time and it s why I can offer this book with a PCB with which you can build your own programmer for very little cost. In this chapter, I will introduce to you the les used to store program data for loading into the microcontrollers and the algorithms used to program various PIC MCU families. For additional information, I recommend that you download Microchip s datasheets explaining the important points for programming PIC microcontrollers. Along with the theory, I will also discuss some approaches used for programmer designs before going on to the next chapter, in which I will show you how to create your own programmer using the PCB that comes with this book.
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Hex File Format
The purpose of assemblers and compilers is to convert application source code into a data format that can be used by a programmer to load the application into a PIC microcontroller. The most popular format (used by Microchip and most other programmers, including the two presented in this chapter) is the Intel 8-bit hex le format. When an application is built (assembled or compiled), a hex le is generated. It may seem unnecessary to explain this, but the le is referred to as a hex le because that is the lename extension given to the generated le. For example, a simple application hex le could look like:
:10000000FF308600831686018312A001A101A00B98 :0A0010000728A10B07288603072824 :02400E00F13F80 :00000001FF
Each line consists of a starting address and data to be placed starting at this address. The offsets of each line have their own functions, which are explained in Table 4.1. Each pair of characters makes up an ASCII byte, with the most signi cant nybble coming rst, followed by the least signi cant nybble. Some of the data is represented
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