EP80579 Datasheet, PDF (1109/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
29.3.1.2 Offset 0Bh: RTC_REGB - Register B (General Configuration)
Table 29-5. Offset 0Bh: RTC_REGB - Register B (General Configuration) (Sheet 1 of 2)
Description:
View: IA F
Base Address: RTC Standard RAM Bank
Offset Start: 0Bh
Offset End: 0Bh
Size: 8 bit
Default: X0X00XXXb
Power Well: RTC
Bit Range
07
06
05
04
03
Bit Acronym
Bit Description
Sticky
SET
PIE
AIE
UIE
SQWE
Update Cycle Inhibit: Enables/Inhibits the update
cycles.
0 = Update cycle occurs normally once each second.
1 = A current update cycle aborts and subsequent update
cycles do not occur until SET is returned to zero. The
BIOS may initialize time and calendar bytes safely.
Note: This bit is not affected by RSMRST# nor any other
reset signal.
Note: Software must ensure this bit transitions from '1'
to '0' once whenever the RTC coin battery is
inserted. This is to ensure that the internal RTC
time updates occur properly.
Periodic Interrupt Enable:
0 = Disabled
1 = Allows an interrupt to occur with a time base set with
the RS bits of register A.
Note: This bit is cleared by RSMRST#, but not on any
other reset.
Alarm Interrupt Enable:
0 = Disabled
1 = the Alarm Interrupt Enable (AIE) bit allows an
interrupt to occur when the AF is one as set from an
alarm match from the update cycle. An alarm can
occur once a second, one an hour, once a day, or
once a month.
Note: This bit is cleared by RTEST#, but not on any
other reset.
Update-ended Interrupt Enable:
0 = Disabled
1 = Allows an interrupt to occur when the update cycle
ends.
Note: This bit is cleared by RSMRST#, but not on any
other reset.
Square Wave Enable: The Square Wave Enable bit
serves no function in this device, but it is in this register
bank to provide compatibility with the Motorola 146818B.
There is not a SQW pin on this device.
Note: This bit is cleared by RSMRST#, but not on any
other reset.
Bit Reset
Value
X
0h
X
0h
0h
Bit Access
RW
RW
RW
RW
RW
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
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