I want to use the alarm timer to wake up from Deep-Sleep(LPC1830) . According to DataSheet,the Alarmtimer is connected directly to the 32kHz OSC. So my question is whether the 32kHz is external clock or internal clock? If it is a external clock should i connected a 32.768kHz Crystal oscillator to RTCX1/RTCX2 ?
I initialize the alarm timer like this: