Intel DH87RL Technical product specification - Page 26

Real-Time Clock Subsystem, Super I/O Controller - bios reset

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Intel Desktop Board DH87RL Technical Product Specification 1.6 Real-Time Clock Subsystem A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer is not plugged into a wall socket, the battery has an estimated life of three years. When the computer is plugged in, the standby current from the power supply extends the life of the battery. The clock is accurate to ± 13 minutes/year at 25 ºC with 3.3 VSTBY applied via the power supply 5 VSTBY rail. NOTE If the battery and AC power fail, date and time values will be reset and the user will be notified during the Power-On-Self-Test (POST). When the voltage drops below a certain level, the BIOS Setup program settings stored in CMOS RAM (for example, the date and time) might not be accurate. Replace the battery with an equivalent one. Figure 1 on page 13 shows the location of the battery. 1.7 Super I/O Controller The I/O controller provides the following features: • Consumer Infrared (CIR) header • Serial IRQ interface compatible with serialized IRQ support for PCI systems • Intelligent power management, including a programmable wake-up event interface The BIOS Setup program provides configuration options for the I/O controller. For information about CIR header Refer to Heading 2.2.2.7, page 52 26

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Intel Desktop Board DH87RL Technical Product Specification
26
1.6
Real-Time Clock Subsystem
A coin-cell battery (CR2032) powers the real-time clock and CMOS memory.
When
the computer is not plugged into a wall socket, the battery has an estimated life of
three years.
When the computer is plugged in, the standby current from the power
supply extends the life of the battery.
The clock is accurate to
±
13 minutes/year at
25 ºC with 3.3 V
STBY
applied via the power supply 5 V
STBY
rail.
NOTE
If the battery and AC power fail, date and time values will be reset and the user will be
notified during the Power-On-Self-Test (POST).
When the voltage drops below a certain level, the BIOS Setup program settings stored
in CMOS RAM (for example, the date and time) might not be accurate.
Replace the
battery with an equivalent one.
Figure 1 on page 13 shows the location of the battery.
1.7
Super I/O Controller
The I/O controller provides the following features:
•
Consumer Infrared (CIR) header
•
Serial IRQ interface compatible with serialized IRQ support for PCI systems
•
Intelligent power management, including a programmable wake-up event interface
The BIOS Setup program provides configuration options for the I/O controller.
For information about
Refer to
CIR header
Heading 2.2.2.7, page 52