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socket has power applied to it along with the programmable oscillator output, and nally, the MCLR# pin goes high. During execution, serial data can be passed to and from the PIC microcontroller with the application stopped when a Ctrl-C (0x003) character is received by the YAP-II. When the Ctrl-C character is received, you will see a funny string of characters overwriting the Running message as is shown in Fig. 4.25. This is caused by invalid serial line data being inadvertently sent by the serial pass-through option (described in the previous paragraph) when the programmed PIC microcontroller s _MCLR line becomes active. This is a by-product of how the PIC16C711 YAP-II controller operates and there is no way to prevent it except to eliminate the pass-through option. When the Ctrl-C is received, the serial interface changes mode with the value of the SerIn line being passed to the host without a full byte being sent. I have chosen to leave this in because I normally use the YAP-II with a Visual Basic front end and I can mask the invalid characters there. The PIC16C711 software used in the YAP-II is quite complex and though it is based on the original YAP application, there have been substantial changes to the operation of the code. Also in the YAP-II application code, because I was using a PIC16C711 (which has a lot more le registers than the YAP s PIC16C61), I was not as restricted in the number of variables that I used in the application. This makes the code somewhat easier to read and follow. The Visual Basic front end (see Fig. 4.26) provides a graphical interface for you to operate the YAP-II. There is an installation package in the PICDwnLd\code\YAPII\YAP-II VB Package folder.
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The interface port (COM1, COM2, or COM3) can be selected from the front window, as well as the PIC microcontroller to work with and the hex le to program into it. The Visual Basic front end continually pings for a YAP-II on the speci ed interface port and indicates when one is available. To simplify the Visual Basic front end, the primary parameters, COM port, hex le, and PIC microcontroller target are saved on your PC s hard disk so that when you start up again, you do not have to re-enter these parameters. When the application is executing, a separate terminal emulator display will allow you to send and receive executing data from your application. When you are working with the YAP-II, I recommend that you initially wire the two top and bottom rails with Vcc and ground as I ve shown in the Windows interface (Fig. 4.26). This will give you convenient power connections as you build a test application circuit.
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Another programmer project I spent a considerable amount of time on was a simple PC parallel port programmer designed to work on a variety of PCs and for both Flash as well as EPROM program memory based PIC microcontrollers. The result of four redesigns was the El Cheapo, which, at the time of the second edition, could have been used in virtually any PC available at that time. Fig. 4.27 shows an assembled El Cheapo. The programmer allowed people to program a variety of ICSP PIC microcontrollers with the exception of the PIC17Cxx and PIC18. The project ultimately collapsed due to the weight of supporting all the different PIC microcontroller part numbers (I gave up when there were more than 175 low-end and mid-range ICSP programmable PIC microcontrollers) and the change in PC hardware from parallel ports that consisted of processor accessible registers to IEEE 1284 compatible ports that no longer provided the basic
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