Motorola 8900 User Manual - Page 43

Permanent termination of Low Power Mode, Data on the Serial interface

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Chapter 2: Hardware Interface Description • Send data to the application over the serial interface. • Enable the serial interface's Ring Indicator (RI_N) signal. Data on the Serial interface While C24 is temporarily awake in Idle mode, data may be transmitted on the serial interface. In case data is being transmitted in any direction, C24 will not return to low power mode. This is regardless of the original wake-up reason or source. C24 will remain awake while data is transferred. Only when the serial interface transfer is completed and the data has been processed, C24 will return to low power mode automatically, according to the ATS24 settings (see Figure 2-9). Figure 2-9: Serial Interface Data Permanent termination of Low Power Mode The C24 low power mode is enabled and disabled by the ATS24 command. To permanently terminate the C24 low power mode, the ATS24 = 0 command must be used. Setting ATS24 = 0 disables the currently active low power mode and switches C24 to Idle mode. C24 will not return to low power mode until an ATS24 > 0 commands is set again. This command can be sent only when the serial interface is active. In case the serial interface is disabled, it must first be activated before sending this command. To reactivate the serial interface, a temporary termination of the low power mode is required, as described in "Temporary Termination of Low Power Mode" on page 18. Following the temporary low power mode termination, the serial interface will activate and the ATS24 = 0 command can be received by C24. December 15, 2008 C24 Module Hardware Description 19

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Chapter 2: Hardware Interface Description
December 15, 2008
C24 Module Hardware Description
19
•
Send data to the application over the serial interface.
•
Enable the serial interface's Ring Indicator (RI_N) signal.
Data on the Serial interface
While C24 is temporarily awake in Idle mode, data may be transmitted on the serial interface. In
case data is being transmitted in any direction, C24 will not return to low power mode. This is
regardless of the original wake-up reason or source. C24 will remain awake while data is
transferred.
Only when the serial interface transfer is completed and the data has been processed, C24 will
return to low power mode automatically, according to the ATS24 settings (see
Figure 2-9
).
Figure 2-9: Serial Interface Data
Permanent termination of Low Power Mode
The C24 low power mode is enabled and disabled by the ATS24 command.
To permanently terminate the C24 low power mode, the ATS24 = 0 command must be used.
Setting ATS24 = 0 disables the currently active low power mode and switches C24 to Idle mode.
C24 will not return to low power mode until an ATS24 > 0 commands is set again.
This command can be sent only when the serial interface is active.
In case the serial interface is disabled, it must first be activated before sending this command. To
reactivate the serial interface, a temporary termination of the low power mode is required, as
described in
“Temporary Termination of Low Power Mode” on page 18
.
Following the temporary low power mode termination, the serial interface will activate and the
ATS24 = 0 command can be received by C24.