User's Manual

MC55/56 Hardware Interface Description
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MC55/56_hd_v03.00 Page 47 of 104 16.08.2005
3.6.6 Wake up MC55/56 from SLEEP mode
A wake-up event is any event that causes the module to draw current. Depending on the
selected mode the wake-up event either switches SLEEP mode off and takes MC55/56 back
to AT+CFUN=1, or activates MC55/56 temporarily without leaving the current SLEEP mode.
Definitions of the state transitions described in Table 11:
Quit = MC55/56 exits SLEEP mode and returns to AT+CFUN=1.
Temporary = MC55/56 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. MC55/56 does not
wake up.
Table 11: Wake-up events in NON-CYCLIC and CYCLIC SLEEP modes
Event Selected mode
AT+CFUN=0
Selected mode
AT+CFUN=5 or 6
Selected mode
AT+CFUN=7, 8, 9
Ignition line No effect No effect No effect
/RTS0 or /RTS1
1)
(falling edge)
Quit + flow control No effect, RTS is only
used for flow control
Mode 7 and 8: No
effect, RTS is only
used for flow control
Mode 9: Temporary +
flow control
Unsolicited Result Code
(URC)
Quit Quit Temporary
Incoming voice or data call Quit Quit Temporary
Any AT command
(incl. outgoing voice or data
call, outgoing SMS)
Not possible
(UART disabled)
Temporary Temporary
Incoming SMS depending on
mode selected by AT+CNMI:
AT+CNMI=0,0 (= default, no
indication of received SMS)
AT+CNMI=1,1 (= displays
URC upon receipt of SMS)
No effect
Quit
No effect
Quit
No effect
Temporary
GPRS data transfer Not possible
(UART disabled)
Temporary Temporary
RTC alarm
2)
Quit Quit Temporary
AT+CFUN=1 Not possible
(UART disabled)
Quit Quit
1)
See section 3.6.6.1 on wake-up via RTS.
2)
Recommendation: In NON-CYCLIC SLEEP mode, you can set an RTC alarm to wake
up MC55/56 and return to full functionality. This is a useful approach because, in this
mode, the AT interface is not accessible.