User's Manual

M50 Hardware Design
M50_HD_V2.0 - 39 -
“AT+CFUN=1”.
For detailed information about “AT+CFUN”, please refer to the document [1].
3.6.2. SLEEP mode
The SLEEP mode is disabled in default firmware configuration. Customer’s application can
enable this mode by “AT+QSCLK=1”. On the other hand, the default setting is “AT+QSCLK=0”
and in this mode, the module cannot enter SLEEP mode.
When “AT+QSCLK=1” is sent to the module, customer’s application can control the module to
enter or exit from the SLEEP mode through pin DTR. When DTR is set to high level, and there is
no on-air or hardware interrupt such as GPIO interrupt or data on UART port, the module will
enter SLEEP mode automatically. In this mode, the module can still receive voice, SMS or GPRS
paging from network but the UART port is not accessible.
3.6.3. Wake up module from SLEEP mode
When the module is in the SLEEP mode, the following methods can wake up the module.
 If the DTR Pin is set low, it would wake up the module from the SLEEP mode. The UART
port will be active within 20ms after DTR is changed to low level.
 Receive a voice or data call from network wakes up module.
 Receive an SMS from network wakes up module.
Note: DTR pin should be held at low level during communication between the module and
DTE.
3.7. Summary of state transition
Table 9: Summary of state transition
Current mode Next mode
Power down Normal mode SLEEP mode
Power down Use PWRKEY
Normal mode AT+QPOWD, use
PWRKEY pin, or use
EMERG_OFF pin
Use AT command
“AT+QSCLK=1” and pull
DTR up
SLEEP mode Use PWRKEY pin, or
use EMERG_OFF pin
Pull DTR down or
incoming call or
SMS or GPRS
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