IS23SC4442 データシートの表示（PDF） - Integrated Silicon Solution

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IS23SC4442

256 BYTE EEPROM WITH WRITE PROTECT FUNCTION AND PROGRAMMABLE SECURITY

Integrated Silicon Solution 

IS23SC4442

ISSI ®

COMMANDS

Command Format

IS23SC4442 provide seven commands that are listed on

Table 1. Every command consists of three bytes.

MSB

CONTROL

LSB MSD

ADDRESS LSB

B7 B6 B5 B4 B3 B2 B1 B0 A7 A6 A5 A4 A3 A2 A1 A0

Note: Command transmission begins with the control byte LSB.

MSB

DATA

D7 D6 D5 D4 D3 D2

LSB

D1 D0

Table 1

Control of Byte 1

B7 B6 B5 B4 B3 B2 B1 B0

Address of Byte 2

A7 ~ A0

Data of Byte 3 Operation

D7 ~ D0

Mode

0 01 10 0 00

0 01 11 0 00

Address

Address

0 01 10 1 00

0 0 1 1 1 1 0 0 Address

0 01 10 0 01

0 01 11 0 01

Address

0 0 1 1 0 0 1 1 Address

Input Data

Input Data

Input Data

Input Data

Read Main Memory

Update Main

Memory

Read Protection

Memory

Write Protection

Memory

Read Main Memory

Update Main

Memory

Compare Data

Data Output

Processing

Output Data

Output Data

Data Output

Processing

Processing

Command Mode

CLK

I/O

Command

0

1

B0 .. B7

...

A0 .. A7

IFD sets I/O

To Level L

24

D07 .. D7

Start from IFD

Stop from IFD

8

Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774

Rev. 00B

08/01/03

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