The maximum clock frequency of the LPC1751FBD80K is 100 MHz.
The pin multiplexing on the LPC1751FBD80K can be configured using the PINSEL registers. Each peripheral function can be assigned to a specific pin using the PINSEL registers.
The LPC1751FBD80K has 64 KB of Flash memory and 16 KB of SRAM.
The ADC on the LPC1751FBD80K can be used by configuring the ADC registers, selecting the ADC clock, and enabling the ADC interrupts. The ADC can be triggered by a software trigger or an external trigger.
Yes, the LPC1751FBD80K can be used with an external crystal oscillator. The external crystal oscillator can be connected to the XTAL1 and XTAL2 pins.