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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 ofteachingtechnicalsubjects 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. 3: Drat_3 • Directives: #INCLUDE, BANKSEL • Instructions: BTFSC, BTFSS, CALL, RETURN • Testing of bit status by means of the BTS instruction • Work with subroutines • Work procedure: • Create a new source file and save it to the folder named “Drat_3” under the “Drat_3.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. 3: Drat_3 • Create a new project (use the procedure from chapter 11): • Project name: Drat_3.mcp, folder Drat_3. • Insert the source file Drat_3.asm. • Check and confirm the correctness of the assignment. • Save the project.

  4. Practical exercises Task No. 3: Drat_3 • 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. • Translate the program (Ctrl F10), eliminate possible errors.

  5. Practical exercises Task No. 3: Drat_3 • Launch the program (F9). • 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. • If the program does not work according to predictions, find the error by means of the procedures which were tried before and correct it.

  6. Practical exercises Task No. 3: Drat_3 • By means of a step-by-step operation (F7, F8), go through the program line after line and watch the behaviour of the program in individual steps. • Focus on the BTFSS instruction and on the way how program branching is implemented. • Notice how the mechanism of subroutine calling and the return from a subroutine works. • Switch over to the MPLAB-SIM mode. • From the “View” menu, select “Hardware Stack”. • In “Stack”, watch how the system of return addresses works during subroutine calling and during the return (from a subroutine).

  7. Practical exercises A programmer´s nightmare – instructions BTFSS, BTFSC • Bit test of a selected register • Skip of the following program line according to the test result

  8. Summary of the subject matter - exercises • Have you noticed any change in the behaviour of the Drat_3 program in comparison with the Drat_1 and Drat_2 programs? • If so, are you able to explain its cause? • Find a proper change in the program listing and explain it!

  9. Summary of the subject matter - exercises • Explain the function of this writing: #define TL1 PORTA,0. • What is the instruction for return from a subroutine? • Can the GOTO instruction be used for return from a subroutine in some cases? • What is so-called “return address”? Where is it saved? • Explain the function of the “STACK” register and the function of the return address system for subroutine calling and for the return from a subroutine.

  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. 3: Source text listing of the “Drat_3” program. • Appendix No. 3, necessary to be translated in Notepad.

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