MC55_ATC_V04.00 Page 37 of 475 3/17/06
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2.8 AT+CFUN Set phone functionality
The AT+CFUN command serves to control the functionality level of the ME. It can be used to reset the ME, to
choose one of the SLEEP modes or to return to full functionality.
Intended for power saving, SLEEP mode reduces the functionality of the ME to a minimum and thus minimizes
the current consumption. SLEEP mode falls in two categories:
• NON-CYCLIC SLEEP mode <fun>=0
• and CYCLIC SLEEP modes, selectable as <fun>= 5, 6, 7, 8 or 9.
NON-CYCLIC SLEEP mode permanently blocks the serial interface. The CYCLIC SLEEP mode, however, is a
dynamic process which alternatingly enables and disables the serial interface. The major benefit of all CYCLIC
SLEEP modes is that the serial interface remains accessible and that, in intermittent wake-up periods, characters
can be sent or received without terminating the selected mode. The best choice is using <fun>= 7, 8 or 9, since
in these modes MC55 automatically resumes power saving, after you have sent or received a short message or
made a call. <fun>=5 or 6 do not offer this feature to the same extent and are only supported for compatibility
with earlier releases. In all CYCLIC SLEEP modes, you can enter <fun>=1 to permanently wake up MC55 and
take it back to full functionality. Please refer to Section 2.8.1, Wake up the ME from SLEEP mode for a summary
of all SLEEP modes and the different ways of waking up the module.
For CYCLIC SLEEP mode (<fun>= 5, 6, 7, 8 or 9) both the ME and the application must be configured to use
hardware flow control. This is necessary since the CTS signal is set/reset every time when the ME listens to a
paging message from the base station. This is the way how the module indicates to the application when the
UART is active. For detailed information on the timing of the CTS signal refer to [2]. The default setting of hard-
ware flow control is AT\Q0 which must be altered to AT\Q3. For use after restart you are advised to add it to the
user profile saved with AT&W.
If both interfaces ASC0 and ASC1 are connected, hardware flow control must be set in either application.
The AT+CFUN test command returns the values of the supported parameters.
The AT+CFUN read command returns the current functionality value.
The AT+CFUN write command can be used to reset the ME, to choose one of the SLEEP modes or to return to
full functionality.
Syntax
Test Command
AT+CFUN=?
Response(s)
+CFUN: (list of supported <fun>s) , (list of supported <rst>s)
OK
Read Command
AT+CFUN?
Response(s)
+CFUN: <fun>
OK
Write Command
AT+CFUN=[<fun>[, <rst>]]
Response(s)
OK
ERROR
+CME ERROR
Reference(s) PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge Last
GSM 07.07 ! % % § § § ! ! !