MC55_ATC_V04.00 Page 426 of 475 3/17/06
Confidential / Released
18. Hardware related Commands
The AT Commands described in this chapter are related to the MC55's hardware interface. More information
regarding this interface is available with the "MC55 Hardware Interface Description"[2].
18.1 AT+CCLK Real Time Clock
Syntax
Parameter Description
Format is "yy/mm/dd,hh:mm:ss", where the characters indicate the two last digits of the year, followed by month,
day, hour, minutes, seconds; for example 6th of July 2005, 22:10:00 hours equals to "05/07/06,22:10:00"
Factory default is "02/01/01,00:00:00"
Notes
• <time> is retained if the device enters the Power Down mode via AT^SMSO.
• <time> will be reset to its factory default if power is totally disconnected. In this case, the clock starts with
<time>= "02/01/01,00:00:00" upon next power-up.
• Each time MC55 is restarted it takes 2s to re-initialize the RTC and to update the current time. Therefore, it
is recommended to wait 2s before using the commands AT+CCLK and AT+CALA (for example 2s after
^SYSSTART has been output).
Test Command
AT+CCLK=?
Response(s)
OK
Read Command
AT+CCLK?
Response(s)
+CCLK: <time>
OK
Write Command
AT+CCLK=<time>
Response(s)
+CME ERROR: <err>
ERROR
OK
Reference(s) PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge Last
GSM 07.07 ! % % % % % % % !
<time>
(str)
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