Temporary Termination Of Low Power Mode - Motorola G24 Developer's Manual

Chapter 2: Hardware Interface Description

Temporary Termination of Low Power Mode

Temporary termination of low power mode occurs when G24 switches from Sleep mode to Idle
mode for a defined period, and then returns automatically to Sleep mode.
Low power mode may be terminated temporarily by several sources, some of which are user
initiated and others are initiated by the system.
Using the WKUPI_N signal
The WKUPI_N signal is an active low input, that is set high by default. By asserting this signal
low the application can wake-up G24 from low power mode and switch to Idle mode.
G24 will remain in Idle mode, awake and fully active, as long as WKUPI_N signal remains low.
When this signal is disabled and set high again, G24 will return to Sleep mode automatically,
according to the ATS24 settings (see Figure 2-10).
Figure 2-10: WKUPI_N Signal Operation
The WKUPI_N signal is the recommended method to temporarily wake-up G24 from low power
mode. It provides the application full control of the G24 operating mode and guarantees that data
on the serial interface will not be lost or misinterpreted.
The WKUPI_N signal must be used to wake up G24 from low power mode if the serial interface
has been disabled by the AT+MSCTS command.
Incoming Network Data
During low power mode, G24 continues monitoring the GSM network for any incoming data,
message or voice calls.
When G24 receives an indication from the network that an incoming voice call, message or data
is available, it automatically wakes up from low power mode to alert the application. When G24
wakes up to Idle mode all its interfaces are enabled.
Depending on the type of network indication and the application settings, G24 may operate in
several methods, which are configurable by AT commands, to alert the application of the
incoming data:
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