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Forum: µC & Digital Electronics Mikrocontroller with Uart


Author: Dave (Guest)
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Hello,

I am looking for a microcontroller with 4 UART interfaces. Does anyone 
know of one?
The best one from the Atmel family.

thanks for the help

Author: Spess53 (Guest)
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Hi

ATMega640/1280/2560

MfG Spess

Author: Dave (Guest)
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Thank you!

What is the difference between ATMEGA 1280V-8AU and ATMEGA 1280-16AU ??

Is one with 8 MHz and the other with 16 MHz?

Author: rico (Guest)
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exactly!

but you can also use software uart for your porject.

greets!

Author: Dave (Guest)
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hello,

I have a little problem. I want to use this Display KIT160-6 with this 
µC Atmega1280. So I have connected the µC with a Max232, but where is 
RTS/CTS?.

Author: Peter Diener (pdiener)
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The uart in the ATmega does not have hardware handshake. You have to 
implement RTS/CTS functions in software by using 2 arbitrary port-pins.

Author: Dave (Guest)
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Can I connect two microcontroller via UART with each other?

Author: Anja (Guest)
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Yes, if both are powered by the same power supply.

Otherwise if you power off one of both controllers the powered off 
device will be powered by the TXD-Line of the other controller. This can 
lead to latch-up effects when the powered off device is switched on 
again.

To avoid this you can use CD4050B gates on each RXD line or use series 
resistors to limit the current to below 0.5mA (which is usually "safe").

Of cause you can use a MAX232 transceiver to avoid latchup-effects too.

with best regards

Anja

Author: Brittany Snow (brittany_snow)
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I am looking for a microcontroller with 4 UART interfaces. Does anyone
know of one?
The best one from the Atmel family.


How about SBC9261-I based on Atmel AT91SAM9261S processor?

Or SBC6300X based on Atmel AT91SAM9263 processor?

They are all good to use.

Author: Dave (Guest)
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I want to build the circuit because of AVR465 and have a little problem. 
I would like to not use the ATmega88 in SMD and DIL. But unfortunately 
this has a different pinout. Do you have to rewrite this program?

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