RS5C348A RICOH Co.,Ltd., RS5C348A Datasheet - Page 17

• Manufacturer Part Number: RS5C348A
• Description: 4-wire Serial Interface Real-time Clock
• Manufacturer: RICOH Co.,Ltd.

Rev.2.01
Second Counter (Address 0h)
Minute Counter (Address 1h)
Hour Counter (Address 2h)
Time Counter (Address 0-2h)
Day-of-week Counter (Address 3h)
D7
-
0
0
D7
-
0
0
D7
-
0
0
D7
-
0
0
*) Default settings: Default value means read / written values when the XSTP bit is set to “1” due to VDD
*
*
*
*) Default settings: Default value means read / written values when the XSTP bit is set to “1” due to VDD
*
*
*
*
Time digit display (BCD format) as follows:
The second digits range from 00 to 59 and are carried to the minute digit in transition from 59 to 00.
The minute digits range from 00 to 59 and are carried to the hour digits in transition from 59 to 00.
The hour digits range as shown in "P12
Mode Selection Bit" and are carried to the day-of-month and day-of-week digits in transition from
PM11 to AM12 or from 23 to 00.
Any writing to the second counter resets divider units of less than 1 second.
Any carry from lower digits with the writing of non-existent time may cause the time counters to
malfunction. Therefore, such incorrect writing should be replaced with the writing of existent time
data.
The day-of-week counter is incremented by 1 when the day-of-week digits are carried to the
day-of-month digits.
Day-of-week display (incremented in septimal notation):
(W4, W2, W1) = (0, 0, 0) → (0, 0, 1)→…→(1, 1, 0) → (0, 0, 0)
Correspondences between days of the week and the day-of-week digits are user-definable
(e.g. Sunday = 0, 0, 0)
The writing of (1, 1, 1) to (W4, W2, W1) is prohibited except when days of the week are unused.
Indefinite
Indefinite
D6
S40
S40
D6
M40
M40
D6
-
0
0
D6
-
0
0
Indefinite
Indefinite
or H20
or H20
Indefinite
D5
S20
S20
D5
M20
M20
D5
P⋅/A
P⋅/A
D5
-
0
0
power-on from 0v or oscillation stopping
power-on from 0v or oscillation stopping
Indefinite
Indefinite
Indefinite
D4
S10
S10
D4
M10
M10
D4
H10
H10
D4
-
0
0
Indefinite
Indefinite
Indefinite
D3
S8
S8
D3
M8
M8
D3
H8
H8
D3
-
0
0
Control Register 1 (ADDRESS Eh) (2) /12⋅24: /12-24-hour
Indefinite
Indefinite
Indefinite
Indefinite
D2
S4
S4
D2
M4
M4
D2
H4
H4
D2
W4
W4
- 17 -
Indefinite
Indefinite
Indefinite
Indefinite
D1
S2
S2
D1
M2
M2
D1
H2
H2
D1
W2
W2
Indefinite
Indefinite
Indefinite
Indefinite
H1
H1
W1
W1
D0
S1
S1
D0
M1
M1
D0
D0
Default Settings *)
(For Writing)
Default Settings *)
(For Writing)
(For Reading)
Default Settings *)
(For Writing)
(For Reading)
Default Settings *)
(For Writing)
(For Reading)
(For Reading)
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Rx5C348A/B