pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 370

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

www.national.com
Host-Controlled Modules and Host Interface
RTC Control Register D (CRD)
Location: Index 0D
Type: RO
Date of Month Alarm Register (DOMA)
Location: Programmable Index
Type: R/W
Month Alarm Register (MONA)
Location: Programmable Index
Type: R/W
Bit
Name
Reset
Bit
Name
Reset
Bit
Name
Reset
6-0
7-0
7-0
Bit
Bit
Bit
7
Reserved.
Valid RAM and Time. This bit senses the voltage that feeds the RTC (V
not it was too low since the last time this bit was read. If it was too low (i.e., < V
(time/calendar registers and CMOS RAM) are not valid. This bit is set after the CRD is read.
0: The voltage that feeds the RTC was too low
1: RTC contents (time/calendar registers and CMOS RAM) valid
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 (“11”), unconditional match is selected (default).
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 (“11”), unconditional match is selected (default).
Valid RAM
and Time
16
7
0
7
1
7
1
6
0
6
1
6
1
5
0
5
0
5
0
Date of Month Alarm Data
Month Alarm Data
Description
Description
Description
370
4
0
4
0
4
0
(Continued)
Reserved
3
0
3
0
3
0
CC
or V
2
0
0
2
0
2
BAT
LOWBAT
) and indicates whether or
), the RTC contents
1
0
1
0
1
0
Revision 1.07
0
0
0
0
0
0