TVME8240 User Manual Issue 1.2.9
Page 66 of 70
10 Installation and Use Notes
10.1 NVRAM Real-Time Clock Control
The TVME8240 provides a M48T59 NVRAM / RTC device with a snaphat battery plugged on top. The
snaphat battery provides power for the SRAM cells when the main power supply is off.
The TVME8240 is shipped with the snaphat battery installed on top of the M48T59 NVRAM device.
The Real-Time Clock function of the M48T59 device is
turned-off by default
, to save battery energy.
If the M48T59 Real-Time Clock function has been turned-off (factory default), it must be
enabled again, before using any other board resources (e.g. Ethernet).
The PMON “date” command can be used to enable the Real-Time Clock function.
Setup / Start the Real-Time Clock function:
PMON> date 200408101445.00
Tue Aug 10 14:45:00 2004
PMON> reboot
Stop the Real-Time Clock function :
(This is recommended for TVME8240 board storage) :
PMON> date -x
Clock is stopped...
PMON>