Alarm - Wavecom Gx64 Application Note

3.2.4

ALARM

The ALARM-signal can be both an internal and external signal for all Wireless CPUs
except GR64001 where it is only an internal signal. Internal means that the RTC is
capable of waking up the main processor as long as VCC is available. External means
that the signal is provided in the system connector. The external availability enables
the application to use an alarm to fully power on not only the Wireless CPU but also
itself, see 3.7.1 below.
The ALARM feature uses the "Time Commands" found in the AT-manual.
commands consist of:
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The clock must be set to the correct time for the alarm to work properly in absolute
mode.
TIP
CAUTION
Gx64 APPLICATION NOTE
Power Management
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AT+CCLK (Set Clock and Date)
AT+CTZU (Automatic Time Zone Update)
AT*EDST (Daylight Saving Time)
AT+CALA (Set Alarm)
AT+CALD (Alarm Delete)
The easiest way to setup the clock correctly is to enable the Automatic
Time Zone Update by sending AT+CTZU=1 followed by AT&W. The
clock will get the time reported by the network. This eliminates the
need to manually setup the clock using the AT+CCLK-command.
AT*EDST does not have to be used if AT+CTZU=1 is sent since the
correct time will periodically be sent to the Wireless CPU from the base
station.
The automatic time zone feature is network dependent. It is not
necessarily available in all markets, or might not be enabled in certain
base stations. The safest way to get proper time setup correctly is to
have the application update the time using the AT+CCLK-command at
a regular interval.
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