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Photograph of an assembled El Cheapo.
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register and bit access. The programmer is an interesting example of how simply a PIC microcontroller programmer circuit can be designed and implemented. To give you an idea of how PC systems have changed over the years, consider this paragraph from the second edition (written in 1999):
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The programmer s speed should not be considered a major consideration because, depending on how the programmer is built, it may work very quickly with one host PC and not at all in another. This is why I went through several revisions of the El Cheapo and YAP-II to make sure that the programmers were as device independent as possible. As I write this, the rst 800 MHz PCs are becoming available with 1 GHz PCs not far away. Coupled with many sub-$500 PCs with Celeron processors running under 400 MHz, the performance range on modern systems is staggering . . .
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My current system is a 2.8 GHz dual core Pentium with my printer on my home s local area network on another PC and connected to it via USB. Modern PCs are simply not systems that can be used for connecting simple programmers like the El Cheapo. This circuit was designed to handle 8-, 14-, 18-, 28-, and 40-pin low-end and midrange PIC microcontrollers that can be programmed using the two-wire ICSP synchronous data protocol that I discussed previously in this chapter. The basic circuit design is shown in Fig. 4.28, which shows how an 18-pin PIC microcontroller is wired into the circuit. The bill of materials for the programmer is listed in Table 4.14. Note that for the 2.5 mm power connector (J1), I have included a Digi-Key part number to make it easier for you to nd. The circuit can be broken up into four major subsystems. The rst is the power supply. The input DC power is passed through the 78L12 to provide the programming voltage (Vpp) for the PIC microcontrollers. This voltage must be at least 13V. To shift
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PROGRAMMING PIC MICROCONTROLLERS
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J1 +15V Wall Wart Output
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U1 78L12
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R1 220 1/2 W
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Top + + C1 C4 10uF 0.1uF CR2 IN914 J2 CR3 IN914 Parallel R3 1K CR1 Port 5.1 V Pin 14 CR5 - _AFDX IN914 R4 1K
R5 10K Q1 R6 - 330
e 3906
s 2N7000
Pin 15 - _ERROR
C3 0.01uF +
Pin 4
C2 0.1uF
- _MCLR
Pin 16 - _INIT Pin 1 - _Strobe Pin 17 - _SLCTL Pin 13 - Busy
Pins 18-25
D G S Top
Pin 14 - Vdd Pin 12 - RB6 Pin 13 - RB7 - Gnd U2 18 Pin - 16Cxx (Programmed Part) Pin 5
R2 - 10K
Transistor Layouts
T0-92 Package Zetex Modified 3906 T0-92 T0-92 Package Package
Top Part Number D G S E B C Top
Figure 4.28 The simple circuitry that can be used to create a PIC microcontroller programmer.
the voltage output of the 78L12 from 12V, I have added two silicon diodes to the ground reference of the 78L12. Each silicon diode will bump up the ground reference by 0.7V, the two of them raising the ground reference to 1.4V and with it, the 78L12 s output to 13.4V above the El Cheapo s ground reference. To provide the 5V Vdd required by the PIC microcontroller, I used a Zener diode and resistor to regulate down the 13.4V to 5.1V. When I checked the programming speci cations of the various PIC microcontroller devices that I wanted this programmer to handle, I found that the maximum Vdd during programming was 40 mA. This value determined what resistor was going to be used in the circuit. For a voltage drop of 8.3V when 40 mA is used, a 207 resistor would be best. I used a 220 resistor simply because I have a lot of them around. The 8.3V drop at 40 mA dissipates 0.33W of power, requiring a 0.5W resistor. If there is no load on the 5.1V power supply, these 40 mA are passed through the Zener diode. Doing the calculation again, the total power dissipated by the Zener diode is 0.24W. To be on the safe side, this diode should be rated for at least half a watt along with the resistor. The 5V power supply is designed so that if it is shorted out, only 40 mA will be supplied by it. This allows the PIC microcontroller to be put and pulled out without switching or disconnecting the power supply. The power supply circuit makes some people uncomfortable, but I ask that you do not change or modify this circuit as it works very well and will protect the circuit, the PIC microcontroller being programmed as well as your PC against anything bad happening. I know of people who have used bench supplies
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