MSM58321 datasheet(7/16 Pages) OKI

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¡ Semiconductor

MSM58321

PIN DESCRIPTION

Name

Pin No.

Description

CS2

CS1

WRITE

Chip select pins. These pins enable the interface with the external circuit when

both of these pins are set at H level simultaneously.

If one of these pins is set at L level, STOP, TEST, WRITE, READ, ADDRESS

WRITE pins and D0 ~ D3 pins are inactivated.

Since the threshold voltage VT for the CS1 pin is higher than that for other pins,

it shuold be connected to the detector of power circuit and peripherals and CS2

is to be connected to the microcontroller.

WRITE pin is used to write data; it is activated when it is at the H level. Data bus

data inside the IC is loaded to the object digit while this WRITE pin is at the H

level, not at the WRITE input edge. Refer to Figure 1 below.

(S1 digit)

WRITE

DATA BUS

CS1 = CS2 = "H"

WRITE

F/F D0-

Figure 1

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