Specifications

33
EPC-30 Hardware Reference
Page 48
Resetting the EPC-30
The EPC-30 can be reset in the following ways:
• Power-off, power-on
• Resets the entire system. The EPC-30 runs the power-on self tests and
reboots the operating system.
• External Reset Input
• A normally open reset switch on the misc. expansion header allows
external resets. Grounding the signal performs a hardware reset. A power-on
self test and a reboot of the operating system follow the external reset.
• BIOS Setup Exit Menu
• When you exit the BIOS set up menus using the ‘Exit and Save
Changes’ option on the Exit Menu, a hardware reset occurs. The system runs
the power-on self tests and reboots the operating system.
• CTRL+ALT+DEL
• Pressing the CTRL, ALT, and DEL keys simultaneously on the
keyboard causes a “warm boot.” The EPC-30 does not reinitialize all of the
processor’s hardware. The power-on self test does not run, but the operating
system reloads.
• NOTE: The CTRL+ALT+ DEL reset method typically works only
under DOS.
• Abnormally Low Supply Voltage
• The EPC-30 resets if the power supply input voltage (+5 VDC Vcc)
falls to +4.65 VDC. The system remains in reset until 200 ms after supply
voltage rises once again above +4.65 VDC.
Brown-Out Protection
The EPC-30 board provides brown-out protection using a Dallas
power supply monitoring chip (U24). When Vcc falls to +4.65
VDC, the Dallas chip detects the voltage drop and drives ~RESET
low. The EPC-30 stays in reset as long as the voltage is at +4.65
VDC or lower and for 200 ms after the voltage rises above
+4.65 VDC.
NOTES