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External RC network, internal RC circuit, external crystal/ceramic resonator, high-speed crystal
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The PIC microcontroller processor requires a clock or oscillator to run. This con guration fuse parameter helps you specify which one from a selection of different options. The watchdog timer (WDT) is used to reset the PIC microcontroller periodically to keep control if basic operation is affected by electrical noise or electrical surges. Brownout detect will force the microcontroller s reset active if incoming voltage falls below either a preset level or a programmed level. This option is used to ensure the power supply and PIC MCU clock have stabilized before releasing reset and allowing the microcontroller to execute. In some devices, varying amounts of program memory can be protected.
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Enable or disable the watchdog timer
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Reset options, including BOD enable
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Internal/external reset used for the PIC microcontroller and if the brownout detect (BOD) circuit is to be used in the application A 70 ms delay can be added to the power-up sequence
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Normally 13 volts is required to place the PIC MCU into programming mode. When LVP is enabled, the microcontroller can be programmed without the high voltage. The MPLAB ICD debugger is external hardware that will allow you to monitor the execution of the microcontroller, set breakpoints, and read/ modify register contents.
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FEATURES UNIQUE TO THE PIC MICROCONTROLLER
that you specify these values in your source code. New PIC microcontroller application developers rarely use this feature because it is not well documented or explained in Microchip datasheets. In assembly and C language include les, there are a number of constant values that are declared as labels for each of the different con guration fuse options. To select the option, use the label with a con guration fuse directive like __CONFIG, which is used in assembly language. The trick to using this directive is recognizing that the constant values are speci ed to only affect the appropriate bits of the con guration fuses. The bits that do not relate to the speci ed con guration fuse register bits are set to 1 in the constant. This way, when you want to specify a number of con guration fuse settings, you simply AND the labels together like this:
__CONFIG _OSC_RC & _INT_MCLR & _WDT_OFF
In this case, the con guration fuse settings will select an RC oscillator, use an internal reset, and disable the watchdog timer. I recommend that all con guration fuse features be listed in the __CONFIG directive even if you aren t planning on using them (and you will be selecting off) because the default value may be contrary to what you want and the PIC microcontroller will not behave as expected. In an example I will show later in the book, in most devices the default value for the watchdog timer is off, and if the off constant label is not selected in the __CONFIG statement, you will end up resetting your application once every two and a half seconds. As application code is presented later in the book, I will discuss the con guration fuse register in greater detail for speci c parts and the characteristics of options available to various chips.
INTERNAL OSCILLATOR CALIBRATION
Many microcontrollers have internal clocks. These circuits are typically implemented out of a ring oscillator, consisting of an RC network providing a delay to a ring oscillator like the one in Fig. 2.9. Typically these circuits run with an accuracy error of 20 percent or more and allow the microcontroller to be used in applications such as logic replacement or in cases where the clock speed is not critical. Using a microcontroller
Microcontroller Oscillator R1 R2 C Frequency = R2 = 10 * R1 1 2.2 * R1 * C
Figure 2.9 Relaxation oscillator used as an internal microcontroller clock. R1 is variable in the PIC microcontrollers with built-in oscillators.
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