M93S66-125 datasheet(8/28 Pages) STMICROELECTRONICS

Part #	M93S66-125

Description	Automotive 4-Kbit, 2-Kbit and 1-Kbit MICROWIRE serial EEPROM with block protection

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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8 / 28 page

Instructions

M93S66-125 M93S56-125 M93S46-125

8/28

Doc ID 022567 Rev 1

Table 2.

Instruction set for the M93S46

Instruction

Description

W

PRE

Start

bit

Opcode

Address(1)

Data

Required

clock

cycles

Additional

comments

READ

Read Data

from

Memory

X

0

1

10

A5-A0

Q15-Q0

WRITE

Write Data

to Memory

1

0

1

01

A5-A0

D15-D0

25

Write is executed if

the address is not

inside the Protected

area

PAWRITE

Page Write

to Memory

10

1

11

A5-A0

N x

D15-D0

9 + N x 16

Write is executed if

all the N addresses

are not inside the

Protected area

WRAL

Write All

Memory

with same

Data

1

0

1

00

01 XXXX

D15-D0

25

Write all data if the

Protection Register

is cleared

WEN

Write

Enable

1

0

1

00

11 XXXX

9

WDS

Write

Disable

X

0

1

00

00 XXXX

9

PRREAD

Protection

Register

Read

X

1

10

XXXXXX

Q5-Q0

+ Flag

Data Output =

Protection Register

content + Protection

Flag bit

PRWRITE

Protection

Register

Write

11

1

01

A5-A0

9

Data above specified

address A5-A0 are

protected

PRCLEAR

Protection

Register

Clear

1

11

111111

9

Protect Flag is also

cleared (cleared Flag

= 1)

PREN

Protection

Register

Enable

1

00

11XXXX

9

PRDS

Protection

Register

Disable

1

00

000000

9

OTP bit is set

permanently

1.

X = Don't Care bit.

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