msm62x42b Oki Semiconductor, msm62x42b Datasheet - Page 20

• Manufacturer Part Number: msm62x42b
• Description: Real Time Clock Ic With Built-in Crystal
• Manufacturer: Oki Semiconductor

MSM62X42B
60
Writing 30-Second ADJ bit (Two Ways A, B)
Reading mehtod 3 in the cass of not using HOLD bit
30-SECOND ADJ BIT ¨ 1
30-SECOND ADJ BIT ¨ 1
ITRPT/STND ¨
MASK ¨
READ 30-SECOND ADJ BIT
30-SECOND ADJ BIT=0?
t
t
1
0
REGISTER C
TIME DATA READ
120µs PASS ?
IRQ FLAG ¨ 0
¨
¨
IRQ FLAG=1
START
START
WAIT t
END
END
(A)
(B)
END
YES
YES
YES
D
READ
CPU senses the
interruption.
*1
*2
1
0
NO
NO
NO
• Initial setting only in power On
• *1 and *2 represent the minimum required time unit.
The other IC causes the interruption.
The interruption is caused by this IC due to
the occurrence of a carry
The IRQ FLAG is cleared to read the next
time data.
For example
t
t
t
•
1
1
1
=0 and t
=1 and t
=1 and t
The reading from or writing into all
bits of registers C
out without any relation to HOLD
bit.
t : 12 hour mode 35µs
0
0
0
=1 when required to a unit of second
= 0 when required to a unit of minute
=1 when required to a unit of hour
24 hour mode 3µs
D
and C
P
can carry
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