The maximum clock frequency that can be used with the internal oscillator is 16 MHz. However, it's recommended to use a clock frequency of 12 MHz or less to ensure reliable operation.
The watchdog timer can be configured using the WWDG_CR register. You need to set the WWDG_CR_WDGA bit to enable the watchdog timer and set the WWDG_CR_T bit to set the timeout period.
The maximum current that can be sourced or sunk by the GPIO pins is 20 mA. However, it's recommended to limit the current to 10 mA or less to ensure reliable operation.
To use the ADC in scan mode, you need to set the ADC_CSR register to select the channels to be converted, and then set the ADC_CSR_SCAN bit to enable scan mode. The ADC will then automatically convert the selected channels in sequence.
The NPOR and NPER bits in the FLASH_CR register are used to configure the flash memory protection. NPOR (Number of Pages to be Written) specifies the number of pages to be written, and NPER (Number of Pages to be Erased) specifies the number of pages to be erased.