Configuration and Setup
EPM-31 Hardware Reference Manual
20
Configuration Switches
Figure 7 shows the as-shipped switch configuration with all switches in the Off position. The Off
position is toward the center of the board.
Figure 7. Location of SW1 Configuration Switch Block
Table 2: Switch Setting Summary
SW1 Switch
Position
Description
Position 1
Clears non-volatile RAM and clears resets real-time clock registers (see page 21)
Off
– Normal operation (default)
On – Clears battery backed up non-volatile memory bytes 0xE-0x7F and clears battery
backed-up RTC registers
Position 2
No Battery Switch
(see Integrator’s Note below)
Off
– A battery is being used (default)
On – A battery is not being used
Position 3
Reset BIOS to factory defaults (see page 21)
Off
– Normal operation (default)
On – Resets BIOS to factory defaults when the board boots.
Position 4
For factory use only. Always leave in the Off position.
Position 5
SPI Flash Security
– Not supported. Leave in the Off position.
Position 6
BIOS select
Off
– Primary BIOS (default)
On – Backup BIOS