RS5C348A RICOH Co.,Ltd., RS5C348A Datasheet - Page 12

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

Rx5C348A/B
Rev.2.01
(1) WALE, DALE Alarm_W Enable Bit, Alarm_D Enable Bit
(2) /12⋅24
(3) /CLEN2 (Rx5C348A)
Register Settings
Control Register 1 (ADDRESS Eh)
D7
WALE
WALE
0
12345
*1) Default settings: Default value means read / written values when the XSTP bit is set to “1” due to
*2) This bit name applies to the Rx5C348A only. For the Rx5C348B the bit name is SCRATCH3..
Setting the /12⋅24 bit to 0 and 1 specifies the 12-hour mode and the 24-hour mode, respectively.
Setting the /12⋅24 bit should precede writing time data
Setting the /CLEN2 bit or the /CLEN1 bit (D3 in the control register 2) to 0, specifies generating clock pulses
with the oscillation frequency of the 32.768-kHz crystal oscillator for output from the 32KOUT pin.
Conversely, setting both the /CLEN1 and /CLEN2 bit to 1 disabling (”H”) such output.
SCRATCH3 (Rx5C348B)
For the Rx5C348B, this bit is intended for scratching and accepts the reading and writing of 0 and 1. The
SCRATCH3 bit will be set to 0 when the XSTP bit is set to 1 in Control Register 2.
24-hour mode
00
01
02
03
04
05
06
07
08
09
10
11
WALE,DALE
/12⋅24
/CLEN2
SCRATCH3
0
1
0
1
0
1
0
1
VDD
D6
DALE
DALE
0
D5
/12⋅24
/12⋅24
0
Description
Description
Description
Description
/12-24-hour Mode Selection Bit
power-on from 0v or oscillation stopping
Disabling the alarm interrupt circuit (under the control of the settings
of the Alarm_W registers and the Alarm_D registers).
Enabling the alarm interrupt circuit (under the control of the settings
of the Alarm_W registers and the Alarm_D registers)
Selecting the 12-hour mode with a.m. and p.m. indications.
Selecting the 24-hour mode
Enabling the 32-kHz clock circuit
Disabling the 32-kHz clock circuit
12-hour mode
12 (AM12)
01 (AM 1)
02 (AM 2)
03 (AM 3)
04 (AM 4)
05 (AM 5)
06 (AM 6)
07 (AM 7)
08 (AM 8)
09 (AM 9)
10 (AM10)
11 (AM11)
/CLEN2
*2)
/CLEN2
*2)
32kHz Clock Output Bit 2
Scratch Bit 3
D4
0
D3
TEST
TEST
0
24-hour mode
12
13
14
15
16
17
18
19
20
21
22
23
- 12 -
D2
0
CT2
CT2
D1
CT1
CT1
0
12-hour mode
32 (PM12)
21 (PM 1)
22 (PM 2)
23 (PM 3)
24 (PM 4)
25 (PM 5)
26 (PM 6)
27 (PM 7)
28 (PM 8)
29 (PM 9)
30 (PM10)
31 (PM11)
D0
CT0
CT0
0
(For Writing)
(For Reading)
Default
*1)
(Default)
(Default)
(Default)
(Default)
Settings