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in these cases is often cheaper and easier than wiring the circuit out of TTL logic or designing a programmable logic device for the task. In the PIC microcontrollers that have internal clocks, Microchip has gone a step further and exchanged the xed resistor with a programmable one. This allows the calibrating of the operating frequency to 1 or 2 percent, allowing the development of more applications that communicate with other intelligent devices or require a repeating signal within a set range. I have used this feature to create a simple circuit (consisting of a battery, a PIC microcontroller, and a few transistors and resistors) that can communicate with a PC via RS-232. For the parts that have internal oscillators, the calibration is stored in program memory at a speci c location determined by Microchip and then loaded into the PIC microcontroller s calibration registers by the application code. This calibration value is normally programmed into the PIC microcontroller by Microchip when the part is built and tested the code to do this varies among the different PIC microcontroller families. The code for reading and storing the calibration value is discussed and demonstrated later in the book. When you are programming an EPROM PIC microcontroller that has an internal oscillator, you have to make sure that the programmer can either read the calibration value after which you must record it down and load it into the programmer when you are reprogramming the PIC microcontroller when the application is burned into it. When I am developing applications using windowed devices, I will usually read the calibration value and write it on the underside of the chip using a Sharpie or other kind of indelible marker. If you have a Flash-based PIC microcontroller, you will discover that many programmers will read the calibration value before erasing the device and then reprogram it with the rest of the application. Obviously, you should make sure that you understand the operation of the programmer you are using when working with Flashbased parts to know if you have to record the con guration value before erasing and reprogramming it.
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Several microcontrollers have simple serial programming interfaces that allow them to be programmed using simple circuitry as well as when they are in the application circuit. Microchip has been a leader in this area as one of the rst to provide a simple programming interface. Many recently released have interface hardware built in for a debugger that allows you to monitor the status of your application or stop at a prede ned point and examine the contents of memory. The debugger interface minimizes the need for expensive in-circuit emulators (ICEs) while providing much of the same functionality. Both these features have been instrumental in allowing students and hobbyists the ability to work with the PIC microcontroller by lowering the cost and the technical complexity of working with microcontrollers. Microchip s in-circuit serial programming (ICSP) protocol is a fairly conventional synchronous communications protocol with the ability to control the state of the microcontroller using a high voltage (12 to 15 V) signal on the reset pin (known as MCLR) of the PIC MCU. Once the microcontroller is in programming mode, data is shifted into
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Figure 2.10 PIC MCU programmers can be as simple as this collection of discrete components connected to a PC s serial port.
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it using a simple communications protocol, which is discussed in the next section. The simplicity of the programming interface allowed the creation of simple no part programmers (like the one shown in Fig. 2.10) for PIC microcontrollers with Flash program memory. The programmer shown in the next section follows many of the same conventions of the programmer shown in Fig. 2.10, but has additional circuitry to ensure voltage levels and avoid the need to create PC code for the synchronous serial interface. The simple programming port also allows the use of a similar interface for debugging an application. The circuitry connected to the programming pins shown in Fig. 2.10 is quite a bit more complex but carries out essentially the same function. Microchip provides the MPLAB ICD 2 tool, which interfaces to the programming interfaces and along with programming controls the operation of the microcontroller to allow you to understand how your program executes. The simple programming interface shown here is not actually the rst programming interface that the designers of the PIC microcontroller came up with. The low-end and PIC17 parts (introduced below) have parallel programming interfaces. ICSP became available with the mid-range parts and is also used for the PIC18 family. The PIC microcontroller really became noticed by hobbyists when Microchip introduced the rst of the chips with program memory based on EEPROM, which could be programmed in circuit using very simple programmers without having to go through an ultraviolet light deletion step.
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