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[SOLVED] How to Interface microcontrollers with Different Operating Voltages

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Hi,

I am trying to interface Microcontroller operating with 3 Volts and Modem operating with 4.2 Volts using UART (Rx and Tx) lines. Can I interface them directly or do we need to use any circuit inbetween. Could you please suggest me any circuit to interface.

Thanking You,
Ravi Kumar G
 

A 3V uC with 5V tolerant inputs can work in this situation without additional level converters, e.g. 3V PIC18 or PIC24.
 

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