The maximum clock frequency that can be used with the internal oscillator is 16 MHz, but it's recommended to use a maximum of 12 MHz to ensure stability and accuracy.
To configure the watchdog timer, you need to set the WDP bits in the WAFR register to select the timeout period, and then enable the watchdog by setting the WDGA bit in the WAFR register. You can also use the IWDG (Independent Watchdog) instead of the WWDG (Window Watchdog) for a more flexible configuration.
No, the UART in the STM8S903F3U6TR only supports asynchronous mode. If you need synchronous communication, you'll need to use a different communication protocol such as SPI or I2C.
You can implement a bootloader using the UART peripheral and the STM8S's built-in bootloader functionality. You'll need to write a custom bootloader that can receive and store the new firmware image in the MCU's flash memory, and then jump to the new firmware. STMicroelectronics provides an example bootloader implementation in the STM8S firmware library.
The maximum amount of current that can be sourced or sunk by the GPIO pins is 20 mA per pin, with a total current limit of 100 mA for all GPIO pins combined. However, it's recommended to keep the current below 10 mA per pin to ensure reliable operation.
STM8S903F3U6TR datasheet
by STMicroelectronics
