EP80579 Datasheet, PDF (1111/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Table 29-6. Offset 0Ch: RTC_REGC - Register C (Flag Register) (Sheet 2 of 2)
Description:
View: IA F
Base Address: RTC Standard RAM Bank
Offset Start: 0Ch
Offset End: 0Ch
Size: 8 bit
Default: 00X00000b
Power Well: RTC
Bit Range
06
05
04
03 : 00
Bit Acronym
Bit Description
Sticky
PF
AF
UF
Reserved
Periodic Interrupt Flag:
0 = No taps are specified.
1 = Set when the tap as specified by the RS bits of
register A is one.
Note: This bit is cleared upon RSMRST# or a read of
Register C.
Alarm Flag:
0 = All Alarm values do not match the current time
1 = All Alarm values match the current time.
Note: This bit is cleared upon RTEST# or a read of
Register C.
Update-ended Flag:
0 = Update cycle not detected
1 = This bit is set immediately following an update cycle
for each second.
Note: The bit is cleared upon RSMRST# or a read of
Register C.
Reserved
Bit Reset
Value
0b
X
0b
000b
Bit Access
RO
RO
RO
29.3.1.4 Offset 0Dh: RTC_REGD - Register D (Flag Register)
Table 29-7. Offset 0Dh: RTC_REGD - Register D (Flag Register)
Description:
View: IA F
Base Address: RTC Standard RAM Bank
Offset Start: 0Dh
Offset End: 0Dh
Size: 8 bit
Default: 10XXXXXXb
Power Well: RTC
Bit Range
07
06
05 : 00
Bit Acronym
Bit Description
Sticky
VRT
Reserved
DA
Valid RAM and Time Bit: This bit is hard-wired to ‘1’ in
the RTC power well. This bit should always be written as a
0 for write cycle, however it will return a 1 for read cycles.
Reserved: This bit always returns a 0 and should be set
to 0 for write cycles.
Date Alarm: These bits store the date of month alarm
value. If set to 000000, then a don’t care state is
assumed. The host must configure the dates alarm for
these bits to do anything, yet they can be written at any
time. If the date alarm is not enabled, these bits return
zeros to mimic the functionality of the Motorola 146818B.
These bits are not affected by any reset assertion.
Bit Reset
Value
1b
0b
XXXXXXb
Bit Access
RW
RW
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
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