MSM62X42B Просмотр технического описания (PDF) - Oki Electric Industry

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MSM62X42B

REAL TIME CLOCK IC WITH BUILT-IN CRYSTAL

Oki Electric Industry 

MSM62X42B

¡ Semiconductor

Reading mehtod 3 in the cass of not using HOLD bit

t1 ¨

*1

t0 ¨

*2

ITRPT/STND ¨ 1

MASK ¨

0

CPU senses the

interruption.

• Initial setting only in 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

REGISTER CD READ

NO

IRQ FLAG=1

YES

WAIT t

TIME DATA READ

IRQ FLAG ¨ 0

END

The other IC causes the interruption.

The interruption is caused by this IC due to

the occurrence of a carry

t : 12 hour mode 35µs

24 hour mode 3µs

The IRQ FLAG is cleared to read the next

time data.

Writing 30-Second ADJ bit (Two Ways A, B)

START

30-SECOND ADJ BIT ¨ 1

READ 30-SECOND ADJ BIT

30-SECOND ADJ BIT=0? NO

YES

END

(A)

START

30-SECOND ADJ BIT ¨ 1

NO

120µs PASS ?

YES

END

(B)

• The reading from or writing into all

bits of registers CD and CP can carry

out without any relation to HOLD

bit.

60

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