barcode reader in asp.net THE EMU-II in Software

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THE EMU-II
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Note TMR0 - Should be OPTION_REG
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Figure 5.15 EMU-II unassembly display showing how a Bank 1 register is displayed with a Bank 0 label.
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number of experiments with interrupt handlers without problems. There is one point I should make clear to you: breakpoints should never be enabled in both an interrupt handler and mainline code. If an interrupt breakpoint is executed while a mainline breakpoint is being handled by the EMU-II, the mainline breakpoint context registers will be changed to the values of the interrupt handler. The execution of the application may also become erratic. If you are debugging an application that requires breakpoints in both the interrupt handler and mainline code, I recommend setting only one at a time and using the C (breakpoint all clear) command before setting the next breakpoint. The Emu-II includes a simple disassembler for reviewing the source code. A typical unassembled application is shown in Fig. 5.15, and there are two things I want to point out about the disassembled function. The rst point to make about the disassembled code is the lack of useful labels. If you were to look at the disassembled code you would see that constant and variable names are not output which makes it much more dif cult to read.
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movlw movwf clrf bsf 0x0FF PORTB PORTA STATUS, RP0
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Turn off all the LED s Use PORTA as the Input Have to go to Page 0 to set Port Direction
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EMULATORS AND DEBUGGERS
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clrf movlw movwf bcf movlw movwf Loop:
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TRISB & 0x07F 0x0D2 OPTION_REG & 0x07F STATUS, RP0 TRISA FSR
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Set all the PORTB bits to Output Setup the Timer to fast count Put in Divide by 8 Prescaler for 4x Clock Go back to Page 0 Have to Set/Read PORTA.0
bsf PORTA, 0 bcf INDF, 0 movlw 0x0100 - 10 clrf TMR0 Sub_Loop1: movf TMR0, w btfss STATUS, Z goto Sub_Loop1 bsf INDF, 0 clrf TMR0 Sub_Loop2: btfsc PORTA, 0 goto Sub_Loop2 comf TMR0, w
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Charge Cap on PORTA.0 Make PORTA.0 an Output Charge the Cap Now, Wait for the Cap to Charge Wait for the Timer to Reach 10 Get the Timer Value Has the Timer Over owed No, Loop Around again
; Now, Wait for the Cap to Discharge ; and Time it. ; Just wait for PORTA.1 to go Low
Get the Timer Value
This is an excellent example of why I prefer only using source code enabled development tools. Trying to get the function of the application from Fig. 5.15 is just about impossible, but when you look at the source, the function that it implements potentiometer measuring code with an RC delay circuit is quite obvious. The second problem with what is pointed out in Fig. 5.15 is that the disassembler doesn t know what bank is currently executing. In Fig. 5.15, you should see that the TRISB register, when it is enabled for all output, is referenced as PORTB (line 5 of the code). This is not a big problem and one that I can usually work my way through without any problems. What I nd to be very confusing in Fig. 5.15 is the identi cation of TMR0 when I want OPTION_REG (or OPTION as it is displayed by the EMU-II). As you step through the application, you will discover that the instruction on the prompt line will display the instruction based on the state of the RP0 bit of the emulated device s STATUS register. While application code can be downloaded to the Emu-II, it cannot be uploaded into a PC. This was speci cally not implemented to discourage the practice of modifying an application in the emulator and then uploading the hex le into the host PC and replicating the application from this source. This is a very dangerous practice and should be avoided at all costs to prevent the proliferation of executable code without supporting application code.
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The Emu-II is probably the most involved application that you will nd in this book. I am pleased with the way it came out and it is a very interesting project and tool to have while learning about the PIC microcontroller. I don t think that it is adequate as a professional development tool due to the lack of a source code interface, but for very simple applications this emulator can be an invaluable tool for you to learn about the PIC microcontroller.
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