lpcware

RTC problems with LPC4330

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by midas on Thu Dec 19 17:07:04 MST 2013
I use a proprietary board based on the LPC4330. I have a 32768Hz crystal connected between RTCX1 and RTCX2, with 18pF capacitors to ground (as recommended in the Data Sheet, 13.3) at short distance from the micro-controller, and a 3V battery connected to Vbat. The battery backed RAM works (maintains content when power removed and restored). However, the RTC oscillator never starts oscillating, and when I try to debug any application that initializes the RTC, the debugger looses connection with the board in Chip_RTC_CalibCounterCmd(), after writing to register CCR ("terminating due to loss of debug control"). I have tried many variations of the RTC initialization code, with added delays inserted - to no avail.
Any ideas?.

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