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RS5C316A

ULTRA-COMPACT SERIAL ALARM REAL-TIME CLOCK ICs

RICOH Co.,Ltd. 

RS5C316A/B

2.3 Interrupt cycle Register (at 7h)

D3

D2

D1

D0

CT3

CT2

CT1

CT0

CT3

CT2

CT1

CT0

(For write operation)

(For read operation)

Bits for selecting the interrupt cycle and output mode at the INTR pin *1

*1) (CT3 to CT0)

The CT3 to CT0 bits are used to select the interrupt cycle and output mode at the INTR pin. There are two interrupt modes selectable: the pulse

mode (when the CT3 bit is set to 0) and the level mode (when the CT3 bit is set to 1). The interrupt cycle and output mode at the INTR pin are shown

in detail in the section on the CTFG bit in “2.1 Control Register 1 (at Eh)”.

2.4 Alarm registers for day-of-the-week, 1-minute, 10-minute, 1-hour, 10-hour (BANK1, at 0h-5h)

D3

D2

D1

D0

AW3

AW2

AW1

AW0 (For read/write) day-of-the-week 1 (at0h)

ALC

AW6

AW5

AW4 (For read/write) day-of-the-week 2 (at1h)

AM8

AM4

AM2

AM1 (For read/write) 1-minute time digit (at2h)

*

AM40 AM20 AM10 (For read/write) 10-minute time digit (at 3h)

AH8

AH4

AH2

AH1 (For read/write) 1-hour time digit (at4h)

ALE

*

AP/A, AH20 AH10 (For read/write) 10-hour time digit (at 5h)

* * 1) The “ ” mark in the above table indicates data which are set to 0 for read cycle and not set for write cycle.

*2) 10-hour time digit indicates AP/A and AH20 with 12-hour and 24-hour time system respectively.

*3) Make sure set an actual time-data to the alarm registers when the alarm function is activated as any imaginary alarm-data will never be match with

the actual time.

*4) The INTR pin can output matched alarm interruption when the ALC bit is set 0 and halt output when the ALC bit is set to 1.

*5) The alarm function is disabled when the ALE bit is set 0 and is enables when the ALE bit is set 1.

*6) Examples of setting alarm time

Setting alarm time

Day-of-the-week

12-hour system

12-hour system

Sun. Mon. Tue. Wed. Thu. Fri. Sat. 10- 1- 10- 1- 10- 1- 10- 1-

AW0 AW1 AW2 AW3 AW4 AW5 AW6 hour hour min min hour hour min min

AM 00:00 every day

111111112000000

AM 01:30 every day

111111101300130

AM 11: 59 every day

111111111591159

PM 00:00

011111032001200

on Monday through Friday

PM 01:30 on Sunday

PM 11:59 on Monday,

Wednesday, and Friday

100000021301330

010101031592359

*7) Hour digits show “12” and “32” when the time is AM 00:00 and PM 00:00 respectively in the 12-hour system.

*8) No alarm interruption is output when all the bit from AW0 through AW6 is set to 0.

*9) Each of the AW0 through AW6 corresponds to the day-of-the-week counter such as (W4, W2, W1)=(0, 0, 0) through (1, 1, 0). Designation of day-of-

the-week and AW0 through AW6 in the above table is one example.

12

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