LPC1756FBD80Y datasheet by NXP Semiconductors

LPC1756FBD80Y 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 25 MHz. However, it's recommended to use a crystal oscillator or an external clock source for more accurate and stable clocking.
• How do I configure the pin multiplexing to use the desired peripherals?
  The pin multiplexing can be configured using the PINSELx registers. Each peripheral function has a specific pin multiplexing setting, which can be found in the datasheet. The PINSELx registers need to be programmed accordingly to enable the desired peripheral function on a specific pin.
• What is the maximum current that can be sourced or sunk by the GPIO pins?
  The maximum current that can be sourced or sunk by the GPIO pins is 4 mA. However, it's recommended to limit the current to 2 mA to ensure reliable operation and to prevent overheating.
• How do I use the ADC in burst mode?
  To use the ADC in burst mode, the ADC must be configured in scan mode, and the channel selection must be done using the ADCSELx registers. The ADC will then convert the selected channels in sequence, and the conversion results can be read from the ADGDR register.
• What is the purpose of the internal pull-up resistors on the GPIO pins?
  The internal pull-up resistors on the GPIO pins are used to pull the pin high when it is configured as an input. This can be useful for reducing power consumption and noise sensitivity. However, the internal pull-up resistors can be disabled if an external pull-up resistor is used.