The maximum clock frequency that can be used with the internal oscillator is 16 MHz. However, it's recommended to use a crystal oscillator or an external clock source for more accurate and stable clocking.
To configure the watchdog timer, you need to set the WDTCLK register to select the clock source, set the WDTCNT register to set the timeout period, and enable the watchdog timer by setting the WDTEN bit in the WDTCTL register. Make sure to service the watchdog timer regularly to prevent a reset.
No, the ADC cannot be used in sleep mode. The ADC requires the MCU to be in run mode to operate. However, you can use the low-power ADC mode to reduce power consumption during ADC conversions.
To implement a low-power design, use the STOP and WAIT modes to reduce power consumption when the MCU is not performing critical tasks. Also, use the low-power modes of the peripherals, such as the low-power ADC mode, and turn off unused peripherals and clocks.
The maximum current that can be sourced or sunk by the GPIO pins is 25 mA. However, it's recommended to limit the current to 10 mA or less to ensure reliable operation and prevent damage to the MCU.
MC9S08SH4CTG datasheet
by Freescale Semiconductor
