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The programming operations wait for the data le for one minute before timing out If you don t want to go through with the programming operation, then sending a 0x003 (Ctrl-C) character to the YAP-II can stop it The programming operations are identical to what is described above except that there is no nal verify operation (other than using the dump command) When each line of the hex le comes in, the address to program is compared against the current value of the shadowed program counter If there is a difference between the two values, the PIC microcontroller s program counter is incremented while the next 6 bytes are coming in These 6 bytes take 50 ms to come in, which is just enough to increment the PIC microcontroller s program counter 50 times.

Wz(T2 - 2-l) = (Wl + T = T1 + W2(7 2 - Td w1+ w2 W,)(T - Tl)

If the difference between the current PIC microcontroller program counter and the speci ed address is greater than 50, then a jump error will be agged by the YAP-II and programming will stop Generally, this is not a major concern as most applications are written with instruction addresses written consecutively and no space left in between the modules in the application When the con guration fuses are programmed (at address 0x02007), the Load Con guration command will be used, which changes the internal program counter to 0x02000 and avoids the need to repetitively increment the PIC microcontroller s program counter This is not true for data EEPROM initialization This data, which is located at address 0x02100 of the hex le, requires a different programming algorithm and cannot be accessed If the de directive is used in your source le, the application will return a jump error.

The con guration memory (at 0x02007) is read for verify by using the G command The 8 bytes starting at 0x02000 are dumped onto the screen (in the same format as the D command), showing you not only the con guration fuses, but the ID locations as well The last four commands specify the operating speed for the PIC microcontroller On the card is an ECS 16 MHz dual output programmable oscillator The primary, 16 MHz output is passed to the PIC16C711, which controls the operation of the YAP-II The secondary output, which has a built-in programmable divisor, is passed to the part in the programming socket when one of these commands is executed When 1, 2, 4, or 8 is sent to the YAP-II from the controlling PC, the PIC microcontroller in the programming.

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.