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Anglicky v odborných předmětech " Support of teaching technical subjects in English “

Anglicky v odborných předmětech " Support of teaching technical subjects in English “. Training program: Mechanic - electrotechnician Program name: Digital processing - microprocessors III. class Microcontrollers Elaborated by: Vlastimil Vlček.

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Anglicky v odborných předmětech " Support of teaching technical subjects in English “

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  1. Anglicky v odborných předmětech"Support of teaching technical subjects in English“ Training program: Mechanic - electrotechnician Program name: Digital processing - microprocessors III. class Microcontrollers Elaborated by: Vlastimil Vlček Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

  2. Practical exercises Task No. 1: Drat_1 Instructions: NOP, BSF, BCF, CLRF, MOVF, MOVLW, MOVWF, GOTO. The meaning of the "d" symbol (destination) • Work procedure: • Create a new (for the time being empty) source file and save it to the folder named “Drat_1” under the “Drat_1.asm” name. • Rewrite the source text from the supplied task printout to the editing window. • Check the finished source text and save it (rewrite the saved empty file).

  3. Practical exercises Task No. 1: Drat_1 • Create a new project (use the procedure from chapter 11): • Project name: Drat_1.mcp, folder Drat_1. • Insert the source file Drat_1.asm. • Check and confirm the correctness of the assignment. • Save the project.

  4. Practical exercises Task No. 1: Drat_1 • Connect the MPLAB ICD-2 debugger to the USB port of the computer. • Connect an instruction board to the ICD-2 and connect the supply voltage of 9V to the instruction board. • Carry out the necessary setups and checks according to the procedure in chapter 11. • Translate the program (Ctrl + F10). • Check the correctness of the translation in the “Output” window. • If errors were reported in the course of translating, find out their cause and eliminate them.

  5. Practical exercises Task No. 1: Drat_1 • Launch the program (Debugger/Run) • Check the correct function of the program: • Press any button on the instruction board (except the Reset button) • Check whether the corresponding LED diode is switched on when the button is pressed. • Try out how the program reacts when more buttons are pressed at the same time.

  6. Practical exercises Task No. 1: Drat_1 • If the program does not work according to expectations, check the source text and try to find an error. When doing this, use step-by-step modes “Step Into, Step Over” and error indication in the “Output” window. • Activate the “Watch” window, display the used registers in it, watch their contentduring the step-by-step operation of the program and compare it with the required values. • In case of any interference in the source text, do not forget to translate the program again and program the microcontroller!

  7. Practical exercises Step-by-step operation of the program: • STEP INTO (F7): one instruction is carried out and, in the Watch window, the content of the selected registers is displayed. • STEP OVER (F8): the main program is stepped, the subroutines run at full speed. • STEP OUT: ensures a quick return from the heart of the subroutine (advantageous especially in delay loops etc.).

  8. Summary of the subject matter - exercises • Why is it necessary to translate the source text before the launch of a program? • How do you best and fastest find out the kind of an error in case of an incorrect translation? • If the translation is carried out faultlessly, does it automatically mean that the program will work as it is supposed to? • What is the principle of the activity of the “In Circuit Debugger (ICD)” mode? In what is its advantage?

  9. Summary of the subject matter - exercises • The NOP instruction (No Operation) does not do anything. What is it good for then? • Explain the function of the BSF and BCF instructions. • Explain the function of the MOVF and MOVWF instructions. • Why is the GOTO instruction labelled as a so-called “conditional jump”? • What comes, conversely, to your mind when you hear the term “unconditional jump”?

  10. References • DatasheetMicrochip PIC16F882/883/884/886/887 DS41291E (http://www.microchip.com) • Microchip.com: GettingStartedwithPICmicroMCUs • Microchip.com: MPLAB IDE User’s Guide • Microchip.com: QuickGuide to MicrochipDevelopmentTools

  11. Appendices • Appendix No. 1: Source text listing of the “Drat_1” program. • Appendix No. 1, necessary to be translated in Notepad.

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