rtc-4553ac Epson Electronics America, Inc., rtc-4553ac Datasheet - Page 12

• Manufacturer Part Number: rtc-4553ac
• Description: Real Time Clock Module
• Manufacturer: Epson Electronics America, Inc.

RTC – 4553AC
8.2. Register Description
8.2.1. Time/Calendar Counter Registers
(1) Second digit counter
(2) Minute digit counter
(3) Hour digit counter
(4) Day of the week digit counter
(5) Day digit counter
(6) Month digit counter
(7) Year digit counter
· In normal mode (CNTR = "0"), the counter is incremented by a write operation.
Counts values from 0 to 59. The counter can be read and incremented. When the second digit counter is
incremented, fractions below full seconds are reset. Therefore a carry occurs 1 second after the increment
operation is finished.
Counts values from 0 to 59. The counter can be read and incremented.
Counts values from 0 to 23. The counter can be read, and the 1-hour digit counter can be incremented.
(The 10-hour digit counter cannot be incremented.)
D0 in the control register 1 sets the 12-hour/24-hour display format.
* PM/AM bit: This bit is output also when 24-hour format is selected.
* Time keeping is not affected also when the 12-hour/24- hour format is switched during clock operation.
Counts values from 0 to 6. The counter can be read and incremented. The correspondence between count
value and day of the week is set by the user.
The counter value is different depending on the month.
(a) For long months (1, 3, 5, 7, 8, 10, 12), the counter counts values from 1 to 31. The counter can be read
(b) For short months (4, 6, 9, 11), the counter counts values from 1 to 30. The counter can be read and
(c) For February, the counter counts values from 1 to 29 if it is a leap year and from 1 to 28 in other years.
Counts values from 1 to 12. The counter can be read and incremented.
Counts values from 0 to 99 for the last two digits of the year. The counter can be read and incremented. Until
2099, leap year compensation is automatically provided. ('92, '96, '00, '04, '08, '12, '16, '20 ... are leap years.)
Example
0 (12-hour format)
1 (24-hour format)
A3
A3
A3
A3
A3
A3
A3
0
0
0
0
0
0
0
1
0
and incremented.
incremented.
The counter can be read and incremented.
1
1
1
1
24/12 bit
A2
A2
A2
A2
A2
A2
A2
0
0
0
0
1
1
1
0
1
0
0
0
1
Coded day of the week
A1
A1
A1
A1
A1
A1
A1
0
0
1
1
0
0
1
0
1
0
1
1
0
Data
AM 12:00 to AM 11:59, PM 12:00 to PM 11:59
AM 00:00 to AM 11:59, PM 12:00 to PM 23:59
A0
A0
A0
A0
A0
A0
A0
0
1
0
1
0
1
1
0
0
1
0
1
0
Name
Name
Name
Name
Name
Name
MO10
Name
MI10
H10
D10
MO1
S10
MI1
Y10
S1
H1
D1
Y1
W
Displayed time
Sun.
PM/AM
0
mi
mo
D3
D3
D3
D3
S
h
D3
d
D3
D3
y
0
0
0
y
0
0
80
8
8
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8
8
8
8
Mon.
1
mi
S
mi
mo
D2
D2
D2
D2
S
h
D2
d
D2
D2
y
w
0
0
y
0
40
40
4
4
4
40
4
4
4
4
Tue.
2
mi
mo
S
mi
D1
D1
D1
h
D1
d
S
h
D1
d
D1
D1
y
w
y
20
20
0
20
20
2
2
2
20
2
2
2
2
Wed.
3
mi
mo
S
mi
mo
D0
D0
D0
h
D0
d
S
h
D0
d
D0
D0
y
w
y
10
10
10
10
1
1
1
10
1
1
1
10
1
Thu.
10-minute digit counter
10-minute digit counter
1-second digit counter
1-minute digit counter
1-minute digit counter
10-month digit counter
4
1-month digit counter
Day of the week digit
10-day digit counter
10-year digit counter
1-day digit counter
1-year digit counter
Register contents
Register contents
Register contents
Register contents
Register contents
Register contents
Register contents
10-second digit
counter
counter
Fri.
5
Sat.
6
MQ - 342 - 01