MSM58321 Просмотр технического описания (PDF) - Oki Electric Industry

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производитель

MSM58321

REAL TIME CLOCK/CALENDAR

Oki Electric Industry 

¡ Semiconductor

MSM58321

Name

D0 ~ D3

GND

ADDRESS

WRITE

BUSY

Pin No.

4~7

8

9

10

Description

Data input/output pins. (Bidirectional bus). The output is a open-drain type and

4.7 kΩ ~ 10 kΩ pull-up registers are required utilize these pins as output pins.

Ground pin.

ADDRESS WRITE pin is used to load address information from the D0 ~ D3 I/O

bus pins to the ADDRESS LATCH inside the IC; it is activated when it is at the H

level. This input is activated by the level, not by the edge. Figure 3 shows the

relationships between the D0 address input, ADDRESS WRITE input, and

ADDRESS LATCH input/output.

D0 input

ADDRESS WRITE

DI0

ADDRESS LATCH

(inside IC)

L

DO0

LATCH output

Figure 3

BUSY pin outputs the IC operation state. It is N-channel MOSFET open-drain

output. An external pull-up resistor of 4.6 kΩ or more must be connected (see

Figure 4) to use the BUSY output. The signals are output in negative logics. If

the oscillator oscillates at 32.768 kHz, the frequency is always 1 Hz regardless of

the CS1 and CS2 unless the D output of the ADDRESS DECODER inside the IC

is H (CODE = H•L•H•H) and CS1 = CS2 = WRITE = H.

Figure 5 shows the BUSY output time chart.

(peripheral circuit power)

4.7 kΩ or more +5V

BUSY

BUSY

N

RESET

MSM58321RS

WRITE

D

Figure 4

BUSY

1 Hz (inside IC)

The counter inside the IC

starts counting at the

1 Hz signal leading edge.

244 µs 122 µs 61 µs

427 µs

Read/write-inhibited period

BUSY

1 Hz (inside IC)

1 sec

Figure 5

15

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