BQ4845_14 Datasheet, PDF (9/24 Pages) Texas Instruments – Parallel RTC With CPU Supervisor

bq4845/bq4845Y
Table 4. Periodic Interrupt Rates
Register B Bits
Periodic Interrupt
RS3
RS2
RS1
RS0
Period
Units
0
0
0
0
None
0
0
0
1
30.5175
µs
0
0
1
0
61.035
µs
0
0
1
1
122.070
µs
0
1
0
0
244.141
µs
0
1
0
1
488.281
µs
0
1
1
0
976.5625
µs
0
1
1
1
1.95315
ms
1
0
0
0
3.90625
ms
1
0
0
1
7.8125
ms
1
0
1
0
15.625
ms
1
0
1
1
31.25
ms
1
1
0
0
62.5
ms
1
1
0
1
125
ms
1
1
1
0
250
ms
1
1
1
1
500
ms
Table 5. Alarm Frequency (Alarm Bits D6 and D7 of Alarm Registers)
1h
ALM1•ALM0
1
0
0
0
0
3h
ALM1•ALM0
1
1
0
0
0
5h
7h
ALM1•ALM0 ALM1•ALM0
Alarm Frequency
1
1
Once per second
1
1
Once per minute when seconds match
1
1
Once per hour when minutes, and seconds match
0
1
Once per day when hours, minutes, and seconds match
0
0
When date, hours, minutes, and seconds match
Aug. 1995
9