Motorola 8900 User Manual - Page 66

WKUPO_N Operation, Controls and Indicators Interface, C24 Module Hardware Description

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Controls and Indicators Interface signal as an indication to switch from low power mode to normal operation, and activate the serial interface. The wakeup-out mechanism, using the WKUPO_N signal, is controlled by 2 AT commands (see Figure 2-24): • ATS102 - Defines the delay time in milliseconds that C24 will wait, after asserting the WKUPO_N signal low, before sending data on the serial interface. This delay is required to allow the application enough time to reactivate from low power mode and switch to normal mode. If ATS102=0, which is the default value, the WKUPO_N signal and mechanism is disabled. In case the serial interface incorporates hardware flow control signals, the data will be sent according to their state, after the ATS102 delay time has expired. • ATS100 - Defines the application minimal wakeup duration, in seconds, for a single wakeup event. This time definition is required to avoid frequent unnecessary wakeup events and consequent ATS102 delays. The application may return to low power mode after the serial interface has been inactive for the duration set by ATS100. This duration is measured from the last data sent or received on the serial interface. Figure 2-24: WKUPO_N Operation The following guidelines apply to the wakeup-out mechanism: • C24 will set the WKUPO_N signal low to indicate that in has data to send through the serial interface. • C24 will start sending the data to the application after the delay defined by ATS102. • The WKUPO_N signal will remain low while data is being sent to the host application. • The host application should keep its serial interface active, and not switch to low power mode, while the WKUPO_N signal is low. • C24 will set the WKUPO_N signal high when it has completed sending the data. • The application serial interface must stay active, and not switch to low power mode, for the duration set by ATS100, after WKUPO_N is set high. • C24 will not set the WKUPO_N signal low if it needs to send additional data during the ATS100 delay time. • The application may switch to low power mode after the WKUPO_N signal is set high and the serial interface has been inactive for the duration set by ATS100. 42 C24 Module Hardware Description December 15, 2008

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Controls and Indicators Interface
42
C24 Module Hardware Description
December 15, 2008
signal as an indication to switch from low power mode to normal operation, and activate the serial
interface.
The wakeup-out mechanism, using the WKUPO_N signal, is controlled by 2 AT commands (see
Figure 2-24
):
•
ATS102 - Defines the delay time in milliseconds that C24 will wait, after asserting the
WKUPO_N signal low, before sending data on the serial interface. This delay is required to
allow the application enough time to reactivate from low power mode and switch to normal
mode.
If ATS102=0, which is the default value, the WKUPO_N signal and mechanism is disabled.
In case the serial interface incorporates hardware flow control signals, the data will be sent
according to their state, after the ATS102 delay time has expired.
•
ATS100 - Defines the application minimal wakeup duration, in seconds, for a single wakeup
event. This time definition is required to avoid frequent unnecessary wakeup events and
consequent ATS102 delays.
The application may return to low power mode after the serial interface has been inactive for
the duration set by ATS100. This duration is measured from the last data sent or received on
the serial interface.
Figure 2-24: WKUPO_N Operation
The following guidelines apply to the wakeup-out mechanism:
•
C24 will set the WKUPO_N signal low to indicate that in has data to send through the serial
interface.
•
C24 will start sending the data to the application after the delay defined by ATS102.
•
The WKUPO_N signal will remain low while data is being sent to the host application.
•
The host application should keep its serial interface active, and not switch to low power
mode, while the WKUPO_N signal is low.
•
C24 will set the WKUPO_N signal high when it has completed sending the data.
•
The application serial interface must stay active, and not switch to low power mode, for the
duration set by ATS100, after WKUPO_N is set high.
•
C24 will not set the WKUPO_N signal low if it needs to send additional data during the
ATS100 delay time.
•
The application may switch to low power mode after the WKUPO_N signal is set high and
the serial interface has been inactive for the duration set by ATS100.