STTS2002_11 datasheet(32/52 Pages) STMICROELECTRONICS

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SPD EEPROM operation

STTS2002

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Doc ID 15389 Rev 5

5.4

Software write protect

Software write-protection allows the bottom half of the memory area (addresses 00h to 7Fh)

to be temporarily or permanently write protected.

Software write-protection is handled by three instructions:

●

SWP: set write protection

●

CWP: clear write protection

●

PSWP: permanently set write protection

The level of write-protection (set or cleared) that has been defined using these instructions,

remains defined even after a power cycle.

Figure 10.

Result of setting the write protection

Table 24.

Operating modes

Mode

RW bit

Bytes

Initial sequence

Current address read

START, device select, RW = 1

Random address read

START, device select, RW = 0, address

reSTART, device select, RW = 1

Sequential read

≥ 1

Similar to current or random address read

Byte write

START, device select, RW = 0

Page write

≤ 16

START, device select, RW = 0

TS write

START, device select, R/W = 0, pointer data, stop

TS read

START, device select, R/W = 1, pointer data, stop

Default EEPROM memory area

state before write access

to the Protect Register

AI01936c

Standard

Array

FFh

Standard

Array

80h

7Fh

00h

Standard

Array

FFh

Write

Protected

Array

80h

7Fh

00h

State of the EEPROM memory

area after write access

to the Protect Register

Memory

Area

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