TS-4800 RTC
From embeddedTS Manuals
The TS-4800 uses an ST Micro M41T00S RTC chip in conjunction with an off-module battery power source to keep accurate system time. This hardware resource is controlled through the use of the Linux-standard hwclock command. More information about hwclock is available in its man page. More information about the hardware battery-backed realtime clock is available from the chip manufacturer's datasheet: http://www.st.com/resource/en/datasheet/m41t00s.pdf