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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?
No, I'd say Hyperbole is how that code reviewer described their skills before getting the job. Since it would be way better if the code reviewer managed a constructive report about what was found wrong and things to consider to improve the code.
Seems reasonable. Also highly likely if that code reviewer calls himself a consultant ;)