Microchip Technology’s PIC® microcontroller is capable of supporting many FACT 1, “Basic PIC16/17 Oscillator Design” and Application Note AN Microchip’s application note AN gives a comparison between ceramic resonators and Crystals used in this application. As an alternative the PIC may be . Microchip Technology Incorporated with respect to the accu- Note AN is an excellent reference if you would like to know more about crystal operation.
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Do I really need 32KHz oscillator? Element 14 website shows many 8MHz but the Microchip website advice to make a clever choice. You only need the 32kHz oscillator if you want to have a low speed oscillator present for uses like ah588 RTC Real Time Clock peripheral, or low speed system mkcrochip operation. It is not required for operation of the microcontroller. The primary oscillator crystal can be anything from 3.
If you want to use the PLL phase locked loop however, it must be between 3.
See note 2 in table below. Note that the PIC24 also has two internal oscillators, of 8MHz and 31kHz, so you can use it without an external crystal. The part datasheet is just an overview, for details you should refer to the Family Reference Manual halfway down the page The Oscillator section is relevant here.
Plenty of technical information on choosing the crystal and load capacitors is given in the Oscillator section above, read this thoroughly particularly section 6. If you do a search on their site you will get other useful app notes such as: You don’t need to use the 32kHz oscillator, but you can use it if you need low power operation, or you want to do timekeeping using a watch crystal. Crystal Oscillators are most important element for microcontroller, Any microcontroller use Oscillator pulses for program execution.
Have you read in any microcontroller tutorial about the instruction execution time cycle? If you use 8MHz crystal instead of 4MHz than your controller execute your program instructions at double speed than 4MHz, Similarly 32MHz crystal has the most fastest time than all other crystal options.
So Why 32KHz crystal is their? In some microcontroller their are some extra features also present, You can use higher value Crystal on Oscillator Pins as well as 32KHz crystal on other pins for microcontroller internal oscillator calibrations, which is a advance level. The choice between 32 kHz and and 8 MHz will depend on your performance requirements and power requirements. High performance and low-power don’t go well together: A microcontroller will typically need ten times more power at 10 MHz than at 1 MHz.
So go for 32 kHz if you can afford it. Also then you have two options, depending on the required timing precision: If you need more accurate timing you’ll need a Those are still inexpensive. Both solutions give you a low power consumption.
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Home Questions Tags Users Unanswered. Make the oscillator choice Ask Question. Could you please help me for this choice. Alin 7, 13 51 Mattew 73 2 7. I should give more information about my circuit: The answer given to my question seem really different. I wish someone could explain me the difference between 2 oscillators with the same frequency how to make the good choice.
AN PIC16/17 Oscillator Design Guide | Application Notes | Microchip Technology Inc.
Microchiip do you think you need a crystal? I though I would need a crystal, how can I be sure the internal oscillator would be enough? SPI is a synchronous protocol it has a clock line so precise timing is not critical, and PWM motor control relies on the average duty cycle so the timing is also not critical here either.
I also added some more to the answer about crystal selection.
See note 2 in table below Note that the PIC24 also has two internal oscillators, of 8MHz and 31kHz, so you can use it without an external crystal. The benefits of the crystal are better timing accuracy needed for things like USB, UART, etc The part datasheet is just an overview, for details you should refer to the Family Reference Manual halfway down the page The Oscillator section is relevant here.
Compact Force Sensor Using AT-Cut Quartz Crystal Resonator Supported by Novel Retention Mechanism
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