The maximum operating temperature range for the LPC812M101JDH20J is -40°C to 105°C.
The internal oscillator on the LPC812M101JDH20J can be configured using the SYSCON registers. The IRC (Internal RC oscillator) is enabled by default, but can be adjusted using the IRCCTRL register.
The maximum clock speed of the LPC812M101JDH20J is 30 MHz.
The ADC on the LPC812M101JDH20J can be used by configuring the ADC registers (AD0CR, AD0GDR, etc.) and using the ADC interrupt to trigger conversions.
Yes, the LPC812M101JDH20J can be used with an external crystal oscillator. The external oscillator can be connected to the XTALIN and XTALOUT pins, and configured using the SYSCON registers.