NH82801GHM S L8YR Intel, NH82801GHM S L8YR Datasheet - Page 413

• Manufacturer Part Number: NH82801GHM S L8YR
• Manufacturer: Intel

Specifications of NH82801GHM S L8YR

• Lead Free Status / RoHS Status: Compliant

LPC Interface Bridge Registers (D31:F0)
10.6.2.3
Intel
®
ICH7 Family Datasheet
RTC_REGC—Register C (Flag Register)
(LPC I/F—D31:F0)
RTC Index:
Default Value:
Lockable:
Writes to Register C have no effect.
3:0
Bit
Bit
2
1
0
7
6
5
4
This bit also causes the RTC Interrupt to be asserted. This bit is cleared upon RSMRST#
or a read of Register C.
Periodic Interrupt Flag (PF) — RO. This bit is cleared upon RSMRST# or a read of
Register C.
0 = If no taps are specified via the RS bits in Register A, this flag will not be set.
1 = Periodic interrupt Flag will be 1 when the tap specified by the RS bits of register A is
Alarm Flag (AF) — RO.
0 = This bit is cleared upon RTCRST# or a read of Register C.
1 = Alarm Flag will be set after all Alarm values match the current time.
Update-Ended Flag (UF) — RO.
0 = The bit is cleared upon RSMRST# or a read of Register C.
1 = Set immediately following an update cycle for each second.
Reserved.
Data Mode (DM) — R/W. This bit specifies either binary or BCD data representation.
This bit is not affected by RSMRST# nor any other reset signal.
0 = BCD
1 = Binary
Hour Format (HOURFORM) — R/W. This bit indicates the hour byte format. This bit is
not affected by RSMRST# nor any other reset signal.
0 = Twelve-hour mode. In twelve-hour mode, the seventh bit represents AM as 0 and
1 = Twenty-four hour mode.
Daylight Savings Enable (DSE) — R/W. This bit triggers two special hour updates per
year. The days for the hour adjustment are those specified in United States federal law
as of 1987, which is different than previous years. This bit is not affected by RSMRST#
nor any other reset signal.
0 = Daylight Savings Time updates do not occur.
1 = a) Update on the first Sunday in April, where time increments from 1:59:59 AM to
Interrupt Request Flag (IRQF) — RO. IRQF = (PF * PIE) + (AF * AIE) + (UF *UFE).
1.
PM as one.
3:00:00 AM.
b) Update on the last Sunday in October when the time first reaches 1:59:59 AM, it
is changed to 1:00:00 AM. The time must increment normally for at least two
update cycles (seconds) previous to these conditions for the time change to occur
properly.
0Ch
00U00000 (U: Undefined) Size:
No
Will always report 0.
Description
Description
Attribute:
Power Well:
RO
8-bit
RTC
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