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RS5C372A-E2

I2C bus SERIAL INTERFACE REAL-TIME CLOCK ICs

RICOH Co.,Ltd. 

RS5C372A/B

2.7-6 Alarm_B day-of-the-week register (internal address Dh)

D7

D6

D5

D4

D3

D2

D1

D0

—

BW6

BW5

BW4

BW3

BW2

BW1

BW0 (For write operation)

0

BW6

BW5

BW4

BW3

BW2

BW1

BW0 (For read operation)

0

Undefined Undefined Undefined Undefined Undefined Undefined Undefined Default*

*) The default means read value when XSTP bit is set to “1” by starting up from 0V, or supply voltage drop, etc.

· Alarm_A, Alarm_B hour register D5 is set to 0 for AM and 1 for PM in the 12-hour display system at AP/A.

The register D5 indicates 10 digit of hour digit in 24-hour display system at AH20.

· To activate alarm operation, any imaginary alarm time setting should not be left to avoid unmatching.

· In hour digit display midnight is set to 12, noon is set to 32 in 12-hour display system. (See section 2.2-1)

· AW0 to AW6 correspond to the day-of-the-week counter (W4, W2, W1) being set at (0, 0, 0) to (1, 1, 0).

· No alarm pulses are output when all of AW0 to AW6 are set to “0”.

Example of Alarm Time Settings

Day-of-the-week

12-hour system

24-hour system

Alarm Time Settings

Sun. Mon. Tue. Wed. Thu. Fri. Sat.

10-hour 1-hour 10-min 1-min 10-hour 1-hour 10-min 1-min

AW0 AW1 AW2 AW3 AW4 AW5 AW6

00:00 AM every day

111111112000000

01:30 AM every day

111111101300130

11:59 AM every day

111111111591159

00:00 PM on

011111032001200

Monday through Friday

01:30 PM on Sunday

100000021301330

11:59 PM on Monday,

010101031592359

Wednesday, and Friday

Designation of days of the week and AW0 to AW6 in the above table is an example.

25

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