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Is interbal RC Osc accurate enough for serial UART TS232 for STM32F103RB?

Question asked by john.john.002 on Jul 22, 2016
Latest reply on Jul 23, 2016 by Clive One
Is it true that 2 to 3% accuracy is required? 

Nucleo F103 has no crystal. Nucleo F401 has 32kHz crystal