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STM32H723ZG Highest USART Baud Rate & Voltage Scaling

ZChen.3
Associate

The datasheet of STM32H723ZG claims to have a highest USART baudrate at 12.5Mbit/s (with 100MHz kernel frequency and 8 oversampling). But with voltage scaling 0 (VOS0), it is possible to have a higher kernel frequency to 137.5MHz, and therefore the baudrate can be increased to 17.18 Mbit/s. The max system clock frequency they put on the datasheet is 550MHz, which is also based on VOS0.

My question is, why all official docs use 12.5Mbit/s, instead of 17.18Mbit/s? Can we go to or use 17.18Mbit/s for USART without any potential issues? When configuring VOS0, the board will go to the so called "boosted performance", will this performance be degraded after "long time" running, like causing issues of clock deviation/degradation or instability issues?

1 REPLY 1
Uwe Bonnes
Principal II

I agree, the datasheet is unclear about the UART limitations. USART limitations are however given.