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There are four different methods of clocking the PIC microcontroller. The different options are designed to ll different application requirements for cost, speed, and accuracy. There are few applications that require extreme accuracy, so cheaper clock designs are more usual. The clock/oscillator options are

1 2 3 4

aspheric generation [35]

Internal oscillators External resistors and capacitors Crystals and ceramic resonators External oscillators

5 /2

Internal oscillators A feature that is becoming more and more prevalent in low-cost PIC microcontrollers is the built-in RC oscillator, as shown in Fig. 9.7, which can be used in place of external oscillator circuitry. The OSCAL register is loaded with a calibration value determined by Microchip during the manufacturing process. This type of oscillator will have an accuracy of 1.0 percent or better while running at 4 MHz. The internal oscillator simpli es application wiring, and if it is used, the pins that are normally used by it can be used as I/O pins, which improves the ef ciency of small-pin-count devices.

Figure 9.7 The internal oscillator consists of a builtin RC oscillator with a calibration register.

Ge during aspheric generation with a resinoid-bonded diamond wheel [35]

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The rst parts that were built had this circuit, but in the last few years, a number of different parts have become available with two built-in oscillators running at 8 MHz and 31 kHz, as shown in Fig. 9.8. Operation of the oscillators, along with the value passed to the rst multiplexor from the postscaler, can provide a system clock of 31, 125, 250, and 500 kHz and so on up to 8 MHz, giving you a considerable range of operating speeds. Unlike the 4-MHz oscillator of the rst PIC microcontrollers built with internal oscillators, this circuit allows for the execution speed of the chip to be changed during operation to minimize power drain, except when you need to perform complex calculations very quickly.

External resistors and capacitors Before introduction of the internal oscillator,

[67]

if you wanted a very-low-cost oscillator circuit, you would have to go with the external RC oscillator option, which consisted of a resistor-capacitor network that provides the clocking for the PIC microcontroller, as shown in Fig. 9.9. The resistor-capacitor charging/discharging voltage is buffered through a Schmidt Trigger noninverting buffer, which is used to enable or disable an N-channel MOSFET transistor pull-down switch. This circuit is quite simple but only accurate to about 10 percent, and it really should not be considered for applications when the internal oscillator is available with no external components and better accuracy.

Figure 9.8 Newer PIC microcontrollers have an internal oscillator circuit that can select operating speeds from 31 kHz to 8 MHz.

earlier Samples 1 and 2 had a similar surface finish after grinding and were polished with fresh and old polishing powders, respectively Because sample 3 had the most ductile streaks after grinding, its curve is the lowest one in Figure 437, although old polishing powder was used

Figure 9.9 The external RC oscillator circuit, which can be built very inexpensively but is very inaccurate.

Originally, the advantage of the RC oscillator was its very low cost and its ability to drive an instruction clock whose output can be used by other devices in the circuit. There are many disadvantages to this method compared with the internal oscillator, and they include

Lower operating speed (normally the RC oscillator can run at a maximum of 1 MHz). Poor accuracy (an error of 30 percent to the target speed is not unusual with poor-

where Zo is the coaxial-cable characteristic impedance Rr is the radiation resistance of the antenna Consider an antenna mounted at a height somewhat less than a quarter-wavelength, such that the radiation resistance is 60 Although not recommended as

Advancement in technology has now made it possible to machine hard and brittle materials to a very close tolerance Ultra-precision machining has been developed, and a new machining concept known as ductile mode machining has been introduced Using this machine coupled with the ductile mode theory, a mirror-like finish can be achieved on the workpiece without the need to polish it [67] [66] In ductile mode machining, feeds and depth of the cut have to be very Fig 437: Roughness (Ra) of a polished aspheric glass surface small of the order of 10 nm and 1 m, versus the polishing time [64] [65]

tolerance capacitors).

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