M93C76-DRE datasheet(11/32 Pages) STMICROELECTRONICS

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M93Cx6-DRE

Instructions

The instruction set of the M93Cx6-DRE devices contains seven instructions, as summarized

in Table 5 to Table 7. Each instruction consists of the following parts, as shown in Figure 5:

READ, WRITE, WEN, WDS sequences:

•

Each instruction is preceded by a rising edge on Chip Select Input (S) with Serial Clock

•

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-DRE 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 maximum ratings specified in “AC

characteristics” tables, in Section 11: DC and AC parameters.

Table 5. Instruction set for the M93C46

Instruction

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

WEN

Write Enable

11X XXXX

11 XXXX

WDS

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

X = Don't Care bit.

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