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Hi, I find a problem when I wanted to run a ATMEGA32 with VCC supply of 3.3V, everything is okay except USART. I see that if supply voltage is 5V then USART works well. With the same ttl/rs232 module and supply voltage of 3.3V USART works fine with STM32 MCU. I used internal 8 Mhz clock both for AVR and ARM. what is the suggestion to overcome the problem in AVR?
Dear John, It is ATMEGA32A AU 1315. The program runs in Atmega32A in 3V3 with no problem like SPI communication but just USART is not okay. Maybe I should use a transceiver designed for 3V3 supply voltage.