The maximum clock frequency that can be used with the internal oscillator is 60 MHz, but it's recommended to use a crystal oscillator for frequencies above 48 MHz for better accuracy and stability.
The pin multiplexing can be configured using the PINSELx registers, where x is the number of the port (0-2). Each PINSELx register controls the function of 4 pins. The datasheet provides a table that shows the possible functions for each pin and the corresponding PINSELx register values.
The minimum voltage required for the ADC to operate correctly is 2.4V, but it's recommended to use a voltage of at least 2.7V for optimal performance.
To implement a watchdog timer reset, you need to enable the watchdog timer by setting the WDTENA bit in the WDTMOD register, and then periodically reset the watchdog timer by writing a specific value to the WDTFEED register. If the watchdog timer is not reset within the timeout period, it will generate a reset signal.
The maximum current that can be sourced or sunk by the GPIO pins is 4mA, but it's recommended to limit the current to 2mA or less to ensure reliable operation.
LPC2103FBD48-S datasheet
by NXP Semiconductors
