cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 430

• Manufacturer Part Number: cs5535
• Description: Geode Cs5535 Companion Multi-function South Bridge
• Manufacturer: National Semiconductor Corporation

www.national.com
RTC Register Descriptions
5.15.2.15 Date of Month Alarm (RTC_DOMA)
I/O Address
Type
Reset Value
5.15.2.16 Month Alarm (RTC_MONA)
I/O Address
Type
Reset Value
Bit
6:0
Bit
7:0
Bit
7:0
7
7
7
Name
VRT (RO)
RSVD (RO)
Name
DOMA_DATA
Name
MONA_DATA
Programmable
R/W
00h
Programmable
R/W
00h
6
6
Description
Valid RAM and Time (Read Only). This bit senses the voltage that feeds the RTC
(VSB or VBAT) and indicates whether or not it was too low since the last time this bit
was read. If it was too low, the RTC contents (time/calendar registers and CMOS RAM)
is not valid. It is clear on V
0: The voltage that feeds the RTC was too low.
1: RTC contents (time/calendar registers and CMOS RAM) valid.
Reserved (Read Only). Reads as 0.
Description
Date of Month Alarm Data. Values may be 01 to 31 in BCD format or 01 to 1F in
binary format. When bits 7 and 6 are both set to one, an unconditional match is
selected (default). Reset by V
Description
Month Alarm Data. Values may be 01 to 12 in BCD format or 01 to 0C in binary format.
When bits 7 and 6 are both set to one, an unconditional match is selected (default).
Reset by V
5
5
(Continued)
RTC_DOMA Bit Descriptions
RTC_MONA Bit Descriptions
RTC_CRD Bit Descriptions
PP
RTC_DOMA Register Map
RTC_MONA Register Map
power-up.
4
4
DOMA_DATA
MONA_DATA
430
PP
power-up.
PP
power-up.
3
3
2
2
1
1
Revision 0.8
0
0