P89LPC9251FDH,112 datasheet by NXP Semiconductors

P89LPC9251FDH,112 Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with the P89LPC9251FDH,112?
  The maximum clock frequency for the P89LPC9251FDH,112 is 25 MHz, but it can be overclocked up to 30 MHz with some limitations.
• How do I configure the oscillator for the P89LPC9251FDH,112?
  The oscillator can be configured using the OSCCFG register. The oscillator frequency can be set to either 12 MHz or 25 MHz, and the oscillator mode can be set to either XTAL or RC.
• What is the purpose of the watchdog timer in the P89LPC9251FDH,112?
  The watchdog timer is used to reset the microcontroller if it becomes stuck in an infinite loop or if there is a software fault. It can be enabled or disabled using the WDTE bit in the WDTMOD register.
• How do I use the UART in the P89LPC9251FDH,112?
  The UART can be used for serial communication. The UART is configured using the UART registers, and the baud rate can be set using the UARTBSEL and UARTBREG registers.
• What is the purpose of the brown-out detection (BOD) in the P89LPC9251FDH,112?
  The BOD is used to detect when the voltage supply drops below a certain threshold, and it can be used to reset the microcontroller or generate an interrupt.