ST72F621L4M1 datasheet by STMicroelectronics

ST72F621L4M1 Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with the internal oscillator?
  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 lower to ensure reliable operation.
• How do I configure the watchdog timer?
  The watchdog timer can be configured using the WWDG_CR register. Set the WWDG_CR[WDGA] bit to enable the watchdog timer, and then set the WWDG_CR[7:0] bits to set the timeout period.
• What is the maximum current that can be sourced or sunk by the GPIO pins?
  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.
• How do I use the ADC converter?
  The ADC converter can be used by configuring the ADC_CSR register to select the channel and trigger mode. Then, start the conversion by setting the ADC_CSR[ADON] bit, and wait for the conversion to complete by polling the ADC_CSR[ADRDY] bit.
• What is the purpose of the NPOR and NPER bits in the FLASH_CR register?
  The NPOR and NPER bits in the FLASH_CR register are used to configure the flash memory protection. NPOR (Non-Protection Option Register) disables the protection of the flash memory, while NPER (Non-Protection Enable Register) enables the protection of the flash memory.