STM8S903K3B6 datasheet by STMicroelectronics

STM8S903K3B6 Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with the internal oscillator?
  The internal oscillator can operate up to 16 MHz, but the maximum clock frequency depends on the voltage and temperature range. Refer to the datasheet for specific details.
• How do I configure the watchdog timer?
  The watchdog timer is configured using the WWDG_CR register. Set the WWDG_CR[WDGA] bit to enable the watchdog timer, and set the WWDG_CR[WDGTB] bits to select the timeout period.
• What is the purpose of the NPOR and NPER bits in the FLASH_CR register?
  The NPOR and NPER bits control 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.
• How do I use the UART in asynchronous mode?
  To use the UART in asynchronous mode, set the USART_CR2[TE] bit to enable the transmitter, and set the USART_CR2[RE] bit to enable the receiver. Configure the baud rate using the USART_BRR register.
• What is the purpose of the IWDG and WWDG timers?
  The IWDG (Independent Watchdog) timer is used to reset the microcontroller if the software becomes stuck or hangs. The WWDG (Window Watchdog) timer is used to monitor the software execution and reset the microcontroller if it does not receive a refresh signal within a specified time window.