M93C46 datasheet(7/31 Pages) STMICROELECTRONICS

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M93C86, M93C76, M93C66, M93C56, M93C46

INSTRUCTIONS

The instruction set of the M93Cx6 devices con-

tains seven instructions, as summarized in Table

5. to Table 7.. Each instruction consists of the fol-

lowing parts, as shown in Figure 4.:

■

Each instruction is preceded by a rising edge

on Chip Select Input (S) with Serial Clock (C)

being held Low.

■

A start bit, which is the first ‘1’ read on Serial

Data Input (D) during the rising edge of Serial

Clock (C).

■

Two op-code bits, read on Serial Data Input

(D) during the rising edge of Serial Clock (C).

(Some instructions also use the first two bits of

the address to define the op-code).

■

The address bits of the byte or word that is to

be accessed. For the M93C46, the address is

made up of 6 bits for the x16 organization or 7

bits for the x8 organization (see Table 5.). For

the M93C56 and M93C66, the address is

made up of 8 bits for the x16 organization or 9

bits for the x8 organization (see Table 6.). For

the M93C76 and M93C86, the address is

made up of 10 bits for the x16 organization or

11 bits for the x8 organization (see Table 7.).

The M93Cx6 devices are fabricated in CMOS

technology and are therefore able to run as slow

as 0 Hz (static input signals) or as fast as the max-

imum ratings specified in Table 20. to Table 23..

Table 5. Instruction Set for the M93C46

Note: 1. X = Don't Care bit.

Instruc

tion

Description

Start

bit

Op-

Code

x8 Origination (ORG = 0)

x16 Origination (ORG = 1)

Address(1)

Data

Required

Clock

Cycles

Address(1)

Data

Required

Clock

Cycles

READ

Read Data from

Memory

A6-A0

Q7-Q0

A5-A0

Q15-Q0

WRITE

Write Data to

Memory

A6-A0

D7-D0

A5-A0

D15-D0

EWEN

Erase/Write Enable

11X XXXX

11 XXXX

EWDS

Erase/Write Disable

00X XXXX

00 XXXX

ERASE

Erase Byte or Word

A6-A0

A5-A0

ERAL

Erase All Memory

10X XXXX

10 XXXX

WRAL

Write All Memory

with same Data

01X XXXX

D7-D0

01 XXXX

D15-D0

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