M95640-WMN3P datasheet(10/42 Pages) STMICROELECTRONICS

Part #	M95640-WMN3P

Description	32Kbit and 64Kbit Serial SPI Bus EEPROMs With High Speed Clock

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M95640, M95320

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Figure 6. Hold Condition Activation

Status Register

Figure 7. shows the position of the Status Register

in the control logic of the device. The Status Reg-

ister contains a number of status and control bits

that can be read or set (as appropriate) by specific

instructions.

WIP bit. The Write In Progress (WIP) bit indicates

whether the memory is busy with a Write or Write

Status Register cycle.

WEL bit. The Write Enable Latch (WEL) bit indi-

cates the status of the internal Write Enable Latch.

BP1, BP0 bits. The Block Protect (BP1, BP0) bits

are non-volatile. They define the size of the area to

be software protected against Write instructions.

SRWD bit. The Status Register Write Disable

(SRWD) bit is operated in conjunction with the

Write Protect (W) signal. The Status Register

Write Disable (SRWD) bit and Write Protect (W)

signal allow the device to be put in the Hardware

Protected mode. In this mode, the non-volatile bits

of the Status Register (SRWD, BP1, BP0) become

read-only bits.

Table 4. Status Register Format

Data Protection and Protocol Control

Non-volatile memory devices can be used in envi-

ronments that are particularly noisy, and within ap-

plications that could experience problems if

memory bytes are corrupted. Consequently, the

device features the following data protection

mechanisms:

■

Write and Write Status Register instructions

are checked that they consist of a number of

clock pulses that is a multiple of eight, before

they are accepted for execution.

■

All instructions that modify data must be

preceded by a Write Enable (WREN)

instruction to set the Write Enable Latch

(WEL) bit. This bit is returned to its reset state

by the following events:

–

Power-up

–

Write Disable (WRDI) instruction

completion

–

Write Status Register (WRSR) instruction

completion

–

Write (WRITE) instruction completion

■

The Block Protect (BP1, BP0) bits allow part of

the memory to be configured as read-only.

This is the Software Protected Mode (SPM).

■

The Write Protect (W) signal allows the Block

Protect (BP1, BP0) bits to be protected. This is

the Hardware Protected Mode (HPM).

For any instruction to be accepted, and executed,

Chip Select (S) must be driven High after the rising

edge of Serial Clock (C) for the last bit of the in-

struction, and before the next rising edge of Serial

Clock (C).

Two points need to be noted in the previous sen-

tence:

AI02029D

HOLD

C

Hold

Condition

Hold

Condition

b7

b0

SRWD

0

BP1

BP0

WEL

WIP

Status Register Write Protect

Block Protect Bits

Write Enable Latch Bit

Write In Progress Bit

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