Subject:
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Re: NXT memory limits
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 5 May 2006 00:25:17 GMT
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Viewed:
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2054 times
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In lugnet.robotics, John Hansen wrote:
> In lugnet.robotics, Jonathan Wilson wrote:
> > Now that the NDA has been lifted, can anyone confirm how much memory is
> > available on the NXT?
> > Also, can anyone confirm what CPU they are using (i.e. what flavor of ARM
> > chip etc?)
>
> The documentation on the LEGO website is a good source:
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> http://mindstorms.lego.com/overview/The_NXT.aspx
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> The chip is the Atmel AT91SAM7S256
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> http://www.at91.com/Pages/products/microcontroller/AT91SAM/AT91SAM7S/at91sam7s.html#product4
>
> Hope this helps,
I would add, for completeness sake, that there is also an ATMEGA48 in the NXT
too.
There are two main reasons for this.
1. The legacy sensor interface requires 5v ADC for the analog inputs.
2. The motor PWM needs some outboard help.
The ATMEGA runs at 5v unlike the AT91SAM7S which runs at 3.3v. Thus the
AT91SAM7S cannot support the necessary ADC functions. It also drives the motor
channels PWM.
The ATMEGA is not user programmable. It communicates with the AT91SAM7S using a
serial interface.
JB
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Message is in Reply To:
 | | Re: NXT memory limits
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| (...) The documentation on the LEGO website is a good source: (URL) chip is the Atmel AT91SAM7S256 (URL) this helps, John Hansen (18 years ago, 4-May-06, to lugnet.robotics)
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