RTC-58321/58323
n
Registers
1. Register table
Address
(hexadecimal)
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
D
3
(A
3
)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D
2
(A
2
)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
D
1
(A
1
)
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
D
0
(A
0
)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Register
name
S
1
S
0
MI
1
MI
10
H
1
H
10
W
D
1
D
10
MO
1
MO
10
Y
1
Y
10
D
3
s
8
*
mi
8
*
h
8
24/12
*
d
8
D
2
s
4
s
40
mi
4
mi
40
h
4
pm/am
w
4
d
4
DATA
D
1
s
2
s
20
mi
2
mi
20
h
2
h
20
w
2
d
2
d
20
mo
2
*
y
2
y
20
*
D
0
s
1
s
10
mi
1
mi
10
h
1
h
10
w
1
d
1
d
10
mo
1
mo
10
y
1
y
10
*
1024Hz
0 to 9
0 to 5
0 to 9
0 to 5
0 to 9
0 to 1 or 0 to 2
0 to 6
0 to 9
0 to 3
0 to 9
0 to 1
0 to 9
0 to 9
Count value
Notes
Seconds units register
Seconds tens register
Minutes units register
Minutes tens register
Hours units register
Hours tens register
Day-of-week register
Day units register
Day tens register
Month units register
Month tens register
Year units register
Year tens register
Reset register
Reference signal registers
Leap year select
mo
8
*
y
8
y
80
*
1hour
mo
4
*
y
4
y
40
*
1minute 1second
2. Notes
(1) The device uses positive logic, and a logic high voltage corresponds to a 1 in a register bit.
(2) Do not set the clock to impossible dates (17:34 pm on February 30th, for example). The results are unpredictable.
(3) When the device is powered on, the initial settings of all bits are undefined.
n
Register functions
1. Date and time registers
(1) The register values are in BCD, and used positive logic.
E.g.(S
8
, S
4
, S
2
, S
1
) = (1, 0, 0, 1) = 9 seconds
(2) Day-of-week register
The value is coded as 0 to 6, with Sunday = 0.
Code
Day
0
Sun.
1
Mon.
2
Tue.
3
Wed.
4
Thu.
5
Fri.
6
Sat.
(3) pm/am, h
20
and h
10
registers
The range of these values depends on whether the 12-hour or 24-hour clock is being used.
The pm/am bit is used only when the 12-hour clock is selected.
Set D
3
to 1 for the 24-hour, and to 0 for the 12-hour clock.
Set D
2
to 1 for pm and to 0 for am. Writing a 1 to bit D
3
automatically resets bit D
2
to 0.
Selection
12-hour clock
24-hour clock
Value range
12:00 to 11:59 am and pm *
00:00 to 23:59
* Note: 12:00 am represents 12:00 midnight, and 12:00 pm represents 12:00 noon.
(4) Y
1
and Y
10
Leap year selection
Bits D
3
and D
2
of the day tens register select the year value module 4 to be used for leap years.
Calendar
Standard calendar
D
3
0
0
1
1
D
2
0
1
0
1
Value module 4 for leap year
0
3
2
1
(5) Do not set the clock to impossible dates (17:34 pm on February 30th, for example). The results are unpredictable.
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EPSON [ EPSON COMPANY ]
