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The AT91MA is a member of the Atmel AT91 16/bit microcontroller family, which is based on .. AT91MA Summary Datasheet (this document) . AT91MA datasheet, AT91MA pdf, AT91MA data sheet, datasheet, data sheet, pdf, Atmel, The AT91MA features 8K bytes of on- chip. AT91MACJ Microchip Technology / Atmel ARM Microcontrollers – MCU BGA IND TEMP datasheet, inventory, & pricing.

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RTC is not accurate enough if customer uses the internal slow clock RC as the clock source. Using an external oscillator in MCP What would you like to know?

Use of external clock source signal instead of crystal in X40 series. Question Can I use external clock source to a9t1m42800a input pin instead of crystal?

Data Sheets

Answer Several AT91 Microcontrollers have been designed with two on-chip oscillators. To answer this question, we are going to split the answer into three parts according to each case.


About AT91MA This device requires only one clock source and features one on-chip low frequency oscillator which can be enabled or disabled at power-up level. The following table summarizes various combinations. We draw the user’s attention to AT91MA boot up without any wait state.

In this condition, having faster clock source at power-up induces user into working with fast boot memory device on NCS0 chip select. At power-up, all these devices enable low frequency oscillator. In this condition, it is not possible to use the external clock signal on this oscillator.

The user will not able to use the external clock source on the Main Oscillator in this case since it is already in service.

AT91MA – Microcontrollers and Processors – Microcontrollers and Processors

Can be used with a crystal or an external clock signal according to the user application which, respectively, is going to or not enable the Main Oscillator. In all cases, the user will not have to fit external clock source signal on both. By default, those oscillators are enabling after a power-up or reset. Was this article helpful?

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Feedback Please tell us how we can make this article more useful. Can I use external clock source to on-chip input pin instead of crystal?

Several AT91 Microcontrollers have been designed with two on-chip oscillators.


Crystal or External Clock Signal? Must be used only with crystal. Reserved for Test.

Boot up from external Memory. Boot up from internal ROM. Both oscillators must be used with crystal only.