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Figure 9.13 The PIC18 has the base oscillator capabilities of the low-end and mid-range PIC micrcontrollers but also has the ability to run from a second oscillator as well as multiplying the incoming clock frequency by four using a PLL.
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Vcc 16F84 0.1 uF Tantalum Gnd + 14 V dd _MCLR
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Figure 9.14 The external reset circuit can be as simple as a pull-up on MCLR#. A momentary on switch tying MCLR# to ground provides a reset control.
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if you have experience with other chips that required a delay on the reset circuit to ensure that power is up and stabilized before starting the device. The internal PIC microcontroller circuitry will not poll the MCLR# pin until power is stabilized and it is ready to start executing. To help make sure that the power-up sequence is reliable, the PWRTE function, which is discussed below, will allow you to delay the power-up sequence even further, primarily for the reason of ensuring that the oscillator is running correctly before the application code starts to execute. The internal reset frees up the MCLR# pin from use as the reset control source and allows it to be used as an input pin. When this feature is enabled, the device reset is active as long as more than 4.0 V is available at Vdd for regular parts or 2.0 V is available in extended voltage parts. The freed MCLR# pin can only be used as an input (no output drivers are built in) and does not have the same clamping diodes as the other PIC microcontroller I/O pins. The brown-out detect (BOD) function, if it is on the PIC microcontroller that you are working with and is enabled, will cause the internal reset circuitry to become active when the Vdd voltage becomes less than 4.0 V in 5-V applications. Some PIC microcontroller part numbers also have a programmable voltage for the BOD function, allowing you to work with other voltages. This can be useful in battery-powered applications, where a drop in battery power can cause intermittent application execution. The base BOD function is enabled through the con guration register and cannot be accessed within the application code except for checking the PCON _BOD bit.
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The PWRTE function, which is enabled in the con guration register and cannot be accessed by the application code, will cause a delay in the start of a PIC microcontroller
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BASIC OPERATING FEATURES
application for 72 ms. This feature is designed to allow the PIC microcontroller internal clock to stabilize before the application starts executing. The PWRTE bit of the con guration register always should be active, unless the application has a clock that is external to the PIC microcontroller that is stable when reset becomes disabled and the PIC microcontroller starts executing.
WATCHDOG TIMER
Environments with noisy power that could encounter large electrical elds or experience large electrostatic discharges (ESDs) can cause the circuits within the PIC microcontroller to become upset and stop executing properly. The reason for the upset is that internal bits in the PIC microcontroller become set to invalid values, resulting in the program counter changing to invalid addresses or the instruction decoder processing an instruction improperly. Often when this happens the PIC microcontroller locks up and will stop executing all together. To help counter this problem, Microchip has designed a watchdog timer (WDT) in all PIC microcontrollers that will reset the PIC microcontroller if normal application execution is lost and the PIC microcontroller starts executing incorrectly or locks up. The watchdog timer (Fig. 9.15) consists of an 18-ms RC oscillator clock delay that will reset the PIC microcontroller if it is allowed to time out. Normally in an application, it is reset before timing out by executing a clrwdt instruction. The over ow (O/F) output of the counter is optionally passed to a prescaler before going to the PIC microcontrollers reset circuit. The prescaler will be discussed in more detail later in this chapter, but its basic purpose is to count over ow events, either from the PIC microcontroller s TMR0 or the watchdog timer. In the case of the watchdog timer, the over ow is passed to the PIC microcontroller s reset circuit when the speci ed number of watchdog timer events has occurred and the prescaler has over owed. The prescaler allows watchdog timer reset delays of from 18 ms to 2.3 s. When the watchdog timer causes a reset in the PIC microcontroller, the _TO bit of the STATUS register is reset. In the initial code of your application, if watchdog timer resets are used, then the _TO bit should be checked because the current le register settings probably will be set from the previous application execution.
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