(USART)3.6v to 5v level shift

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#1
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i have to connect two devices(xmega and GPRS Module).
to each other using USART Cominucation.
xmega works on 3.6 V and another one woks with 5v.
my problem is when i want transmit data from GPRS to xmega data is garbage!!!.
i think this problem is voltage level.
any body has any idea to solve this problem or any level shifter circuit?!

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There's a sticky thread about 3.3V<->5V connection at the top of the General Electronics forum.

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Would you mind lead me to a direct link?

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Gamu The Killer Narwhal
Portland, OR, US
_________________
Atmel Studio 6.2
Windows 8.1 Pro
Xplained boards mostly