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The maximum clock frequency that can be used with the internal oscillator is 16 MHz.
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To configure the watchdog timer to reset the MCU, set the WDPG bit in the WCR register to 1, and then set the WDV bit to 1 to enable the watchdog timer. The watchdog timer will then reset the MCU if it is not reset or disabled within the timeout period.
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The NPOR (Number of Pages to be Written) and NPIWE (Number of Pages to be Erased) bits in the FLASH_CR register are used to configure the flash memory programming and erasing operations. NPOR specifies the number of pages to be written, and NPIWE specifies the number of pages to be erased.
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To use the UART in asynchronous mode, set the M bit in the USART_CR2 register to 0, and then configure the baud rate using the USART_BRR register. The UART will then operate in asynchronous mode, transmitting and receiving data using the TX and RX pins.
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The IWDG (Independent Watchdog) and WWDG (Window Watchdog) timers are used to monitor the MCU's activity and reset it if it becomes stuck or hangs. The IWDG timer is used to monitor the MCU's activity at the instruction level, while the WWDG timer is used to monitor the MCU's activity at the window level.