Artesyn MVME3100 Single Board Computer Installation and Use (June 2014) - Manual (Page 81)

Functional Description
MVME3100 Single Board Computer Installation and Use (6806800M28E) 81
4.11 General-Purpose Timers
There are a total of eight independent, 32-bit timers. Four timers are integrated into the
MPC8540 and four timers are in the PLD. The four MPC8540 timers are clocked by the RTC
input, which is driven by a 1 MHz clock. The clock source for the four timers in the PLD is 25
MHz. Refer to the MPC8540 Reference Manual listed in
Appendix B, Related Documentation , for
additional details and/or programming information.
4.12 Real-time Clock Battery
There is an on-board Renata SMT battery holder on the MVME3100. This SMTU2430-1 holder
allows for quick and easy replacement of a 3V button cell lithium battery (CR2430), which
provides back-up power to the on-board DS1375 RTC. A battery switching circuit provides
automatic switching between the 3.3V and battery voltages. The battery provides backup
power to the RTC for a minimum of one year at nominal temperature.
4.13 Reset Control Logic
The sources of reset on the MVME3100 are the following:
 Power-up
 Reset switch
 Watchdog timer
 System Control register bit
 VMEbus reset
A board-level hard reset generates a reset for the entire board including the MPC8540, local
PCI/PCI-X buses, Ethernet PHYs, serial ports, Flash devices, and PLD(s). If the MVME3100 is
configured as the VME system controller, the VME bus and local TSi148 reset input are also
reset.