User's Manual Part 1
MC75 Hardware Interface Description
Strictly confidential / Draft
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MC75_V00.190a Page 27 of 91 15.02.2005
3.2.1.3 Reset MC75 via AT+CFUN Command
To reset and restart the MC75 module use the command AT+CFUN. You can enter
AT+CFUN=,1 or AT+CFUN=x,1, where x may be in the range from 0 to 9. See [1] for details.
If configured to a fix baud rate (AT+IPR0), the module will send the URC “^SYSSTART” to
notify that it is ready to operate. If autobauding is enabled (AT+IPR=0) there will be no
notification. To register to the network SIM PIN authentication is necessary after restart.
3.2.1.4 Reset MC75 in Case of Emergency via EMERG_RST
Caution: Use the EMERG_RST pin only when, due to serious problems, the software is not
responding for more than 5 seconds. Pulling the EMERG_RST pin causes the loss of all
information stored in the volatile memory since the processor restarts immediately.
Therefore, this procedure is intended only for use in case of emergency, e.g. if MC75 does
not respond, if reset or shutdown via AT command fails.
The EMERG_RST signal is available on the application interface. To control the
EMERG_RST line it is recommended to use an open drain / collector driver.
To actually reset the MC75 module, the EMERG_RST line must be pulled to ground for
≥10ms. After releasing the line MC75 will start again.
After hardware driven restart, notification via “^SYSSTART” URC is the same as in case of
restart by IGT or AT command. To register to the network SIM PIN authentication is
necessary after restart.