MSM6242B 查看數據表（PDF） - Oki Electric Industry

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产品描述 (功能)

生产厂家

MSM6242B

DIRECT BUS CONNECTED CMOS REAL TIME CLOCK/CALENDAR

Oki Electric Industry 

¡ Semiconductor

MSM6242B

3. CH (Chip Select)

1

VIH and VIL of CH1 has 3 functions.

a) To accomplish the interface with a microcontroller/microprocessor.

b) To inhibit the control bus, data bus and address bus and to reduce input gate pass

current in the stand-by mode.

c) To protect internal data when the mode is moved to and from standby mode.

To realize the above functions:

a) More than 4/5 VDD shoud be applied to the MSM6242B for the interface with a

microcontroller/microprocessor in 5V operation.

b) In moving to the standby mode, 1/5 VDD should be applied so that all data buses should

be disabled. In the standby mode, approx. 0V should be applied.

c) To and from the standby mode, obey following Timing chart.

To Standby Mode

4 ~ 6V

VDD

4V

2 ~ 4V

2µs (MIN)

CS1

2

5

VDD

1

5

VDD

CS0 : H

or WR : H

From Standby Mode

4V

2µs (MIN)

4

5

VDD

4. Set SDT.P at alarm mode

Set alarm at 9:00

MASK BIT ← 0

ITRPT/STND BIT ← 1

t1, t0 ← 1

Read Register CD

Start interruption

CPU Activation

NO

D2 = 1?

YES

Read H10 and

H10 Cotent

Repeat

NO

AM 9:00?

YES

CPU HALT

or

CPU STAND BY

39

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