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As I ve said throughout this book, most people think of the PIC microcontroller as something like the PIC16F84, which has a processor, some program memory ash, and a number of digital input-outputs (I/Os) and is easy/cheap to program. The plethora of interfacing options available to the developer is rarely recognized because the large number of PIC microcontroller part numbers allows you to select a chip that best meets your application s requirements. The phrase best meets requires a bit of consideration. When I am designing an application, I rst look at it from three perspectives: overall system cost, electrical and software complexity, and responsiveness. It is important to come up with a solution that balances out all three of these dimensions. For example, you can get a PIC microcontroller that costs 50 cents or less, but it most likely will be very dif cult to interface with other devices and will require a lot of software complexity and additional hardware devices, and it may take a long time to respond to user input. Similarly, a very sophisticated chip may provide the interface features that are required but have an unacceptably high cost. When I think of best meets, I want the various components of an application to work together effectively and the resulting application to be cost-effective and ef ciently designed and work to the user s speci cations. This is why I encourage you to look at the features available within the different PIC microcontroller part numbers, and when you are learning the basics of the device, look at what is available as built-in features of other devices and think of ways that these features can simplify the task that you are trying to implement.
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Mid-Range Built-in EEPROM/Flash Access
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An increasingly popular feature in PIC microcontroller devices is the availability of builtin EEPROM memory that can be used to store con guration, calibration, or software data. In one of the example applications, I use it to store application source code. In midrange devices, this feature can be accessed using the registers. In some low-end devices, EEPROM is accessed as if it were an I2C device attached to the PIC microcontroller. In the next section I will discuss how these devices work. Along with accessing data, in some Flash program memory devices (such as the PIC16F87x and all the PIC18F chips) also can read and write Flash program memory from within the application. This feature was added originally to allow the MPLAB ICD debugger to update the Flash in circuit, but it is useful for storing larger amounts of data in a nonvolatile memory, as well as changing application codes, as I do in the EMU-II emulator and have discussed in Chap. 12. For data EEPROM I/O, there are four registers that you should be aware of: EECON1, EECON2, EEADR, and EEDATA. These registers are used to control access to the EEPROM. As you would expect, EEADR and EEDATA are used to provide the address and data interface into the up to 256-byte data EEPROM memory. EECON and EECON2 are used to initiate the type of access as well as indicate that the operation has completed. EECON2 is a pseudoregister that cannot be read from but is written to with the data (0x55/0xAA to indicate that the write is valid). EECON1 contains the bits listed in Table 16.1 for controlling access to the EEPROM. These bits may be in different bit positions in different devices, which is why I have not speci ed the bit values in the table.
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TABLE 16.1 BIT
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THE CRITICAL EECON1 BITS FUNCTION
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Set to access program memory; reset to access data EEPROM only in PIC microcontrollers that have application/MPLAB ICD updatable program memory Flash. Set if a write error is terminated early to indicate that data write may not have been successful. When set, a write to EEPROM begins. Set to indicate an upcoming write operation; cleared when the write operation is complete. Set to indicate read operation; cleared by next instruction automatically.
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