Motorola Mobility LLC T56KT1 User Manual

G30 incorporates a Real Time Clock (RTC) mechanism that performs many internal functions, 
one of which is keeping time. The RTC subsystem is embedded in the PMU and operates in all of 
the G30 operating modes (Off, RTC, Idle, Sleep), as long as power is supplied above the 
minimum operating level.

The G30 time and date can be set using the following methods:

Automatically retrieved from the GSM network.
In case G30 is operated in a GSM network that supports automatic time zone updating, it will 
update the RTC with the local time and date upon connection to the network. The RTC will 
continue to keep the time from that point.

Using the AT+CCLK command.
Setting the time and date manually by this AT commands overrides the automatic network 
update.
Once the time and date are manually updated, the RTC timer will keep the time and date 
synchronized regardless of the G30 operating state.

When the power supply is disconnected from G30 and no voltage is supplied to the VRTC pin, 
the RTC timer will reset and the current time and date will be lost. On the next G30 power-up the 
time and date will need to be set again automatically or manually.

A 47uF capacitor should be connected between ground and VRTC signal (pin 62 of the 
81-pin LGA interface/pin 60 of the 70-pin connector).