[SOLVED] LPC2138 rtc battery backup does not work correctly

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mi14chal

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I have a problem with an internal RTC in LPC2138 b/c battery backup does not work, when I unplug power supply and then plug it I get a random time it seems that battery backup does not work correctly but why? Here is a schematic of connection page 1: https://wydawnictwo.btc.pl/pdf/zl7arm.pdf and this code I'm using to configure RTC:
Code: 
CCR = (1 << 0) | (1 << 4); // Clock enable and choose the external oscillator
 

I found out why it won't work. This module which I bought has connection between Vbat and Vdd... so a battery is not enough to power uC. I chose external RTC and now it works perfectly.
 

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