STTS2002_11 STMICROELECTRONICS [STMicroelectronics], STTS2002_11 Datasheet - Page 32

• Manufacturer Part Number: STTS2002_11
• Description: 2.3 V memory module temperature sensor with a 2 Kb SPD EEPROM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

SPD EEPROM operation
5.4
32/52
Table 24.
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:
●
●
●
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
Current address read
Random address read
Sequential read
Byte write
Page write
TS write
TS read
SWP: set write protection
CWP: clear write protection
PSWP: permanently set write protection
Memory
Mode
Area
Operating modes
Default EEPROM memory area
state before write access
to the Protect Register
Standard
Standard
Array
Array
RW bit
1
0
1
1
0
0
0
1
Doc ID 15389 Rev 5
FFh
80h
7Fh
00h
Bytes
≤ 16
≥ 1
1
1
1
2
2
START, device select, RW = 1
START, device select, RW = 0, address
reSTART, device select, RW = 1
Similar to current or random address read
START, device select, RW = 0
START, device select, RW = 0
START, device select, R/W = 0, pointer data, stop
START, device select, R/W = 1, pointer data, stop
State of the EEPROM memory
area after write access
to the Protect Register
Protected
Standard
Array
Write
Array
Initial sequence
FFh
80h
7Fh
00h
STTS2002
AI01936c