why we use 12MH crystal in ARM LPC 2148

why we use 12MH crystal in ARM LPC 2148

massman

Member

Updated: Oct 26, 2024

Views: 1.4K

Hello, I am an electronics engineer from Solapur and I have a query. I want to know why we use 12MH crystal in ARM LPC 2148? Does anyone have any idea about this? Please help me.

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Harshad Italiya

Member • Apr 12, 2012

massman
why we use 12MH crystal in ARM LPC 2148
Basically Crystal used to provide clock to Microcontroller. Now a days Internal RC oscillator is used to generate clock for the system but if we are talking about accuracy then Crystal has more accuracy in clock timing and there might be some error in Internal RC.

It is not necessary to connect 12Mhz Crystal with ARM LPC 2148 if it is being used for clock source you can check datasheet, There is range of the Crystal Frequency provided you can any between that range.

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massman

Member • Apr 19, 2012

thankssssssssssssssss..........................😀

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massman

Member • Apr 19, 2012

how to design 3.3v power supply using 7805 for ARM processer.?

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Harshad Italiya

Member • Apr 22, 2012

massman
thankssssssssssssssss..........................😀
please refrain your post One S looks fine. 😉
massman
how to design 3.3v power supply using 7805 for ARM processer.?
well for that you can use LD1117S33 or LM317 Which is variable using resistor setting you can design 3.3V regulator.

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Vignesh Raghav

Member • Apr 26, 2012

Also 12MH crystal to have faster synchronization when datas are transferred . just to avoid latency period ! Correct my statement if I am wrong .

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nowire9

Member • Apr 27, 2012

massman
how to design 3.3v power supply using 7805 for ARM processer.?
See pages 22-23 of the #-Link-Snipped-# for a simple example circuit using the 7805 voltage regulator.

As far as components, you just need the 7805 and two capacitors (0.33uF & 0.1uF) for the basic circuit.

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EDIT:
Oh, you said 3.3V power supply! Sorry about that. Go with godfather's advice to adjust output level...

Or, you could step down the voltage with a couple of diodes in series (typical diodes have a 0.7V drop, so two of them would bring the voltage down to 3.6V, three of them would bring the voltage down to 2.9V).

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