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After the program memory has been loaded with the application code, Vpp should be cycled off and on and the PIC microcontrollers program memory read out and compared against the expected contents. When this verify is executed, Vpp should be cycled again with Vdd a minimum voltage (4.5V) and then repeated again with Vdd at a maximum voltage (5V) value. When this verify is executed at voltage margins, the PIC microcontroller is said to be production programmed. If the margins are not checked, programming operation is said to be prototype programmed. Most hobbyist programmers (including the ones presented in this book and the Microchip PICSTART Plus) are prototype programmers because they cannot margin Vdd when the chip is programmed. Microchip uses a modi ed version of this programming algorithm for PIC microcontrollers that have Flash program memory. The actual programming algorithm is quite a bit simpler and programmers designed for just Flash parts are often a few basic electronic parts. What makes Flash programming different from ICSP programming is the need to erase the contents of program memory before starting to program (this operation is not required for EPROM parts, which have their contents erased using ultraviolet light). The same connections to the PIC microcontroller are used (Fig. 4.12) for programming Flash-based chips as EPROM-based ones. Electrically, the programming voltages are basically the same as required for the mid-range devices. There is the difference (noted earlier in this section) in the voltage and current required for Vpp. For PIC microcontrollers with EPROM program memory, up to 50 mA are required for EPROM programming. The PIC MCUs with Flash-based program memory have a built-in VPP generator that provides adequate voltage and current to program while requiring very little current from the

Listen to each other Pay special attention during the question-andanswer period Don t step on each other s lines, which means don t begin speaking until other panel members have nished If a question has been answered incompletely or needs to be clari ed, other panel members should feel free to add to the answer Do so tactfully and without making the rst speaker or group feel embarrassed Nonverbal communication counts Remember that the whole panel is onstage before, during, and after the presentation Give full attention to the speaker; don t look around the room, practice your speech, or talk with someone else on your panel While one person from the group is speaking, all other members should keep their eyes on the presenter Develop your own language Agree on a signal that the group members can use to indicate that a speaker s time is up.

programmer. The same data packet format is used for the Flash-based PIC microcontrollers, but the commands and how they work are slightly different (as shown in Table 4.6). The data, as in the EPROM parts, is always 16 bits with the rst and last bit always equal to zero. Data is always transferred LSB rst using the same timings as speci ed earlier in the chapter for the mid-range parts. When I have designed PIC microcontroller programmers, I multiply the data word by 2 (or shift it to the left by one) to provide a 16-bit word with the rst and last bit equal to zero and the data word in between. The programming cycle for the Flash-based PIC microcontrollers is:

There is no EndProgramming command required, but the 10 ms delay makes programming Flash parts somewhat slower. There are no multiple program/verify steps.

the computer in this domain is to manipulate those variables which can best offset the influence of the above uncontrolled variables on the plant economy. Complicated as all this seems to be, often a fairly simple relation can be derived in an effort to optimize part of the plant, or to partially optimize the whole plant. As an example, consider a simplified absorption tower where a gas stream F, containing z percent of a valuable material, is absorbed by a liquid stream L, which is to be manipulated to maintain minimum-cost operation. Assume that gas-exit composition y varies as follows:

Load Con guration Load Data for Program Memory Load Data for Data Memory Read Data from Program Memory Read Data from Data Memory Increment Program Counter Begin Programming Bulk Erase Program Memory BulkEraseDataMemory

The only issue left to discuss is how to erase the program memory before programming. Like the EPROM devices, the Flash program memory, when erased, converts speci c 1s in memory to 0s. As with the EPROM device s ultraviolet erase, the Flash erase step loads 1s in all the memory locations. The erase operation could be accomplished using the bulk erase commands listed in Table 4.6, but I prefer to use the Microchip speci ed erase for speci c devices. These operations will erase all Flash and EEPROM memory in the PIC microcontroller device, even if code protection is enabled. In the general case, the instruction sequence is:

1 2 3 4 5 6 7 8 9

Apply Vpp. Execute load con guration (0b0000000 + 0x07FFE). Increment the PC to the con guration register word (send 0b0000110 seven times). Send command 0b0000001 to the PIC microcontroller. Send command 0b0000111 to the PIC microcontroller. Send begin programming (0b0001000) to the PIC microcontroller. Wait ten ms. Send command 0b0000001. Send command 0b0000111.