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TC63_ATC_V00.490

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5/24/05

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The parameter can only be used if the serial interface is enabled. 

Due to the command syntax, you need to enter parameter 

, followed by 

 is only a

placeholder and has no effect. See examples below. 
[0]

Placeholder for 

 as stated above. 

1

ME resets and restarts to full functionality. After reset and restart, PIN 1

authentication is necessary (

). If autobauding is enabled, it is recom-

mended to wait 3 to 5 seconds before entering the first AT command. For

details on autobauding refer to Section 

. 

• If both serial interfaces ASC0 and ASC1 are connected, any functionality level set with 

 takes effect

on both of them. In Multiplex mode, the CFUN profile is shared by all multiplexer channels. 

• If the ME is in Multiplexer mode, it is not recommended to activate SLEEP mode with 

. The

best approach to properly control SLEEP mode in this case is to issue the PSC messages described in 

,

Section "Power saving control". 

• When a circuit-switched call is in progress, 

=7 or 9 can be activated without terminating the call. How-

ever, setting 

=0 during a circuit-switched call immediately disconnects this call. 

• To check whether power saving is on, you can query the status with the read command AT+CFUN? only if

the module is in full functionality mode or in CYCLIC SLEEP mode. If available, you can also take advantage

of the status LED controlled by the SYNC pin (see 

 and 

). With 

 you can select differ-

ent modes of LED signalization during SLEEP modes (see Section 

 for details). However, the module can wake up temporarily from power saving without leaving its

CYCLIC SLEEP mode (without changing +CFUN "

"), e.g. for a network scan after a loss of radio cov-

erage, or after receipt of serial data during CYCLIC SLEEP mode. During this "temporary wakeup state" the

LED will operate as if the ME was in full functionality mode. 

• Recommendation: In NON-CYCLIC SLEEP mode, you can set an RTC alarm to wake up the ME and return

to full functionality. This is a useful approach because, in this mode, the AT interface is not accessible. 

A wake-up event is any event that causes the ME to draw more current. Depending on the selected mode, the

wake-up event either switches the SLEEP mode off and takes the ME back to full functionality 

=1, or

activates the ME temporarily without terminating the selected SLEEP mode. 

Definitions of the state transitions described in Table 

: 

• Quit: ME exits SLEEP mode.
• Temporary: ME becomes active temporarily for the duration of the event and the mode-specific follow-up time

after the last character was sent or received on the serial interface.

• No effect: Event is not relevant in the selected SLEEP mode. The ME does not wake up.

Table 2.3:  Wake-up events in NON-CYCLIC and CYCLIC SLEEP modes

<rst>

(num)

Event

Selected mode:

=0

Selected mode:

=7 or 9

Ignition line 

No effect 

No effect 

/RTS0 or /RTS1 activation 

Quit 

Mode 7: No effect (RTS is only 

used for flow control)

Mode 9: Temporary 

Unsolicited Result Code (URC)

Quit 

Temporary 

Incoming voice or data call 

Quit 

Temporary