The maximum operating temperature range for the LPC1857FET256 is -40°C to +105°C.
The clock settings for the LPC1857FET256 can be configured using the Clock Control Unit (CCU) registers. The CCU provides a flexible clock generation and distribution system that allows the user to configure the clock frequencies and sources for the various peripherals and domains.
The maximum frequency for the LPC1857FET256 is 180 MHz.
The ADC on the LPC1857FET256 can be used by configuring the ADC registers and enabling the ADC clock. The ADC can be triggered by a software trigger or by an external trigger signal. The ADC conversion result can be read from the ADC result registers.
Yes, the LPC1857FET256 can be used with an external crystal oscillator. The external crystal oscillator can be connected to the XTALIN and XTALOUT pins, and the clock frequency can be configured using the Clock Control Unit (CCU) registers.
LPC1857FET256 datasheet
by NXP Semiconductors
