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Micro Crystal
Extrem Low Power Real Time Clock / Calendar Module
03h - Hours
This register holds the count of hours, in two binary coded decimal (BCD) digits. Values will be from 00 to 23 if the
12/24 bit (see CONFIGURATION REGISTERS, 10h - Control1) is clear. If the 12/24 bit is set, the AM/PM bit will be
0 for AM hours and 1 for PM hours, and hour values will range from 1 to 12.
Hours Register (24 Hour Mode)
Address
Function
Hours
03h
Reset
Bit
Symbol
7
GP3
6
GP2
5:0
Hours
Hours Register (12 Hour Mode)
Address
Function
Hours
03h
Reset
Bit
Symbol
7
GP3
6
GP2
5
AM/PM
4:0
Hours
04h – Date
This register holds the current day of the month, in two binary coded decimal (BCD) digits. Values will range from
01 to 31. Leap years are correctly handled from 1900 to 2199.
Address
Function
Date
04h
Reset
Bit
Symbol
7
GP5
6
GP4
5:0
Date
Bit 7
Bit 6
Bit 5
GP3
GP2
20
0
0
0
Value
0 or 1
Register bit for general purpose use.
0 or 1
Register bit for general purpose use.
00 to 23
Holds the count of hours, coded in BCD format.
Bit 7
Bit 6
Bit 5
GP3
GP2
AM/PM
0
0
0
Value
0 or 1
Register bit for general purpose use.
0 or 1
Register bit for general purpose use.
0
AM hours.
1
PM hours.
1 to 12
Holds the count of hours, coded in BCD format.
Bit 7
Bit 6
Bit 5
GP5
GP4
20
0
0
0
Value
0 or 1
Register bit for general purpose use.
0 or 1
Register bit for general purpose use.
01 to 31
Holds the current day of the month, coded in BCD format.
Bit 4
Bit 3
Bit 2
10
8
4
0
0
0
Description
Bit 4
Bit 3
Bit 2
10
8
4
0
0
0
Description
Bit 4
Bit 3
Bit 2
10
8
4
0
0
0
Description
RV-1805-C3
Bit 1
Bit 0
2
1
0
0
Bit 1
Bit 0
2
1
0
0
Bit 1
Bit 0
2
1
0
1
15/98
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