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What is the use of frequency in microcontroller?
The frequency forms the basis for comparing two different microcontrollers. The 8051 microcontroller runs with a minimum 12 oscillator cycles in order to execute a machine function. The performance of an 8051 microcontroller can be improved simply by increasing the clock frequency.
What is difference between crystal frequency and clock frequency?
@Jayaram Reddy • 04 Dec, 2014 • 3 likes Clock frequency will be generated using any oscillator circuits or 555 timer or Opamps and it will be in square wave form. Crystal frequency is generated by crystal oscillator which generates frequency by vibrating. And the wave will be in non square shape [almost sine].
What is meant by crystal frequency?
A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a constant frequency. Quartz crystals are manufactured for frequencies from a few tens of kilohertz to hundreds of megahertz.
What is the relationship between 8086 processor frequency and crystal frequency?
8086 microprocessors require a clock frequency of 5MHz. 8284A clock generator and driver IC has a divide-by-3 circuit internally to divide the connected crystal’s frequency (33% duty cycle) to synchronize with external event such as another 8284A clock generator and driver IC.
What should the clock frequency of a microcontroller be?
Comparing clock frequency between anything other than related processors in the same family is largely meaningless. Another issue is that some micros have fancy internal clock chains including PLLs and dividers. The purpose is so that they can run at a variety of speeds from easy to use and find crystals. 8-16 MHz is a nice frequency for a crystal.
When to use a crystal based oscillator for a microcontroller?
When you need seriously high precision and stability without the additional cost of a crystal-based oscillator IC, opt for the standalone-crystal approach. Parts with tolerance below 20 parts per million (i.e., 0.002%) are readily available.
Which is more reliable crystal or silicon oscillator?
Silicon oscillators are more reliable than crystals and ceramic resonators, especially in harsh environments subject to shock or vibration. But they’re also more expensive. When you need seriously high precision and stability without the additional cost of a crystal-based oscillator IC, opt for the standalone-crystal approach.
Why should I choose this frequency instead of a lesser frequency?
For example when you say ARM® Cortex®-M3 revision 2.0 running at up to 48 MHz, what is the implication to the over-all performance of the Chip and connecting circuit as a whole? Why should I choose this Frequency and not a lesser or higher frequency instead?