MSM62X42B Просмотр технического описания (PDF) - Oki Electric Industry

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MSM62X42B

REAL TIME CLOCK IC WITH BUILT-IN CRYSTAL

Oki Electric Industry 

¡ Semiconductor

Reading method 1 in the case of not using HOLD bit

MSM62X42B

Reading from

Registers S1~W

First

Data of

DATA1 ¨ Registers

S1~ W

Reading from

Registers S1~W

Second

Data of

DATA2 ¨ Registers

S1~ W

DATA1=DATA2

YES

END

NO

* The reason why the registers are read

twice is to avoid the case during the

variation of information because a

carry has occurred accidentlly.

Reading method 2 in the case of not using HOLD bit

t1 ←

*1

t0 ←

*2

ITRPT/STND ← 1

MASK ←

0

Initial setting only at power On

• *1 and *2 represent the minimum required time unit.

For example

t1=0 and t0=1 when required to a unit of second

t1=1 and t0=0 when required to a unit of minute

t1=1 and t0=1 when required to a unit of hour

IRQ FLAG ← 0

WAIT t

TIME DATA READ

Note

See Note below

t : 12 hour mode 35µs

24 hour mode 3µs

REGISTER CD READ

IRQ FLAG=0

NO

YES

Normal read

~ Retried the reading since a carry occurred during the operation.

(Note) Do this process within the following time requirements

by combination between t1 and t0.

t1=0, t0=1

t1=1, t0=0

t1=1, t0=1

within 1 second

within 1 minute

within 1 hour

59

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