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

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THE EMU-II
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Unsupported features and potential limitations of the EMU-II to be aware of include:
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Applications must start with a nop to allow an emulator execution breakpoint (this
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is the same as what MPLAB ICD requires).
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The PIC16F877 reset pin is passed to the application but consists of just an unbounced
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10K pull-up and pull-down switch
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The 4 MHz clock available to the EMU-II is not distributed to the application circuit. It is not recommended that power provided on the board be distributed to the appli-
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cation circuit.
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Built-in assembly of instructions is not supported. There is a patch ( ) command,
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There is no protected program memory for the application. For this reason, writes to
Flash/data EEPROM are not recommended except using the built-in functions described below. Applications to be emulated are limited to 1,792 instructions in size. The EMU-II cannot single-step from a return, retlw, or ret e instruction. Variable memory in banks 2 and 3 should not be accessed. The rst order of business was to come up with a circuit to start from. The initial circuit was very similar to the YAP-II s and I designed a PCB that was based on the YAP-II s. I jokingly said that the circuit was almost identical to the YAP-II the two ends are the same, only the middle was changed. This is actually quite true for the PCB that I designed for the board (the Gerber les of which can be found on the McGraw-Hill website). The nal circuit I came up with is shown in Fig. 5.14. What is not shown is that either a PIC16F877 or PIC16F876 can be used for driving the EMU-II. To allow either part to be used in the emulator, I avoided using PORTD and PORTE (which are not available in the 28 pin PIC16F876) for control pins. The PCB, which is presented below, is designed to accept either a PIC16F877 or PIC16F876. The reason for doing this was some initial problems with getting PIC16F876 parts when I was specifying the application. The bill of material for the Emu-II is listed in Table 5.1. There is a 19-pin connector that includes ten LEDs, two buttons, two potentiometers, a speaker, and some pull-ups that are wired exactly the same way as the YAP-II s builtin I/O devices. When you look at this circuit, you should notice ve important differences between it and the YAP-II. They are:
The use of a PIC16F877/PIC16F876 instead of a PIC16C711. A 4 MHz ceramic resonator is used instead of a programmable oscillator. The processor signals passed to the breadboard area are different. The addition of U4, which is labeled 16F84 and is a socket in which 18-pin Scotch ex DIP connectors can be used to pass the emulated signals from the EMU-II to a development board. A number of PIC16F877/PIC16F876 I/O pins are unavailable in the Emu-II.
The EMU II schematic.
THE EMU-II
TABLE 5.1 PART
BILL OF MATERIAL FOR THE EMU-II DESCRIPTION
U1 U2 U3 U4 U5 U6 T1 Q5 CR1, CR6 CR2, CR3, CR4, CR5, CR7 CR4 Y1 R1 R2, R7 R3 C1 C2 C3 C4 C8 SW1 SW2 J1 J2 J3 J4, J6 Misc.
PIC16F877-04/P or PIC16F876-04/SP 18-pin (ZIF) DIP socket 74LS123 single shot 78L12 +12 volt regulator in TO-92 package MAX232 RS-232 interface 7805 +5 volt regulator in TO-220 package 2N3904 NPN transistor ZVP2106A P-channel MOSFET transistor Red LED 1N1414 silicon transistors 1N4001 silicon transistor 4 MHz ceramic resonator with internal capacitors 10K, 1/4 watt resistor 220 , 1/4 watt resistor 330 , 1/4 watt resistor 10 uF, 35V electrolytic capacitors 0.01 uF tantalum capacitor 1.0 uF capacitor, any type SPST switch Momentary on SPST switch 2.5mm power socket 9-pin female D-shell connector 19 5 1 socket 1 ICSP connector
PCB board, wiring
The EMU-II is designed to emulate an 18-pin PIC microcontroller as closely as possible. The I/O signals from the PIC16F877/PIC16F876 are available to the breadboard in exactly the same fashion as the YAP-II. This has resulted in some restrictions in how the PIC16F877/PIC16F876 is used:
The USART port is dedicated to the EMU-II function. The RCSTA, TXSTA, RCREG,
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