MC9S08JM32CLH datasheet by Freescale Semiconductor

MC9S08JM32CLH 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 20 MHz, but it's recommended to use 16 MHz or lower for optimal performance and to ensure that the device operates within its specifications.
• How do I configure the watchdog timer to reset the device in case of a fault?
  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. You also need to periodically reset the watchdog timer by writing a specific value to the WDTSR register to prevent a reset.
• Can I use the USB module in device mode and host mode simultaneously?
  No, the USB module on the MC9S08JM32CLH can only operate in either device mode or host mode, but not both simultaneously. You need to configure the USB module for the desired mode using the USBCTL register.
• How do I implement a low-power mode to reduce power consumption?
  The MC9S08JM32CLH has several low-power modes, including Stop, Wait, and Doze modes. To implement a low-power mode, you need to set the appropriate bits in the PMCCTL register to select the desired mode, and then execute the WAIT or STOP instruction to enter the low-power mode. You can also use the LPM instruction to enter a low-power mode.
• What is the maximum amount of current that can be sourced or sunk by the GPIO pins?
  The maximum amount of current that can be sourced or sunk by the GPIO pins on the MC9S08JM32CLH is 25 mA per pin, with a total current limit of 100 mA for all GPIO pins combined.