SLE4442 Siemens, SLE4442 Datasheet - Page 20

• Manufacturer Part Number: SLE4442
• Description: (SLE4432 / SLE4442) 256 Byte EEPROM
• Manufacturer: Siemens

2.3.4 Write Protection Memory (SLE 4432 and SLE 4442)
The execution of this command contains a comparison of the entered data byte with the assigned
byte in the EEPROM. In case of identity the protection bit is written thus making the data information
unchangeable. If the data comparison results in data differences writing of the protection bit will be
suppressed. Execution times and required clock pulses see UPDATE MAIN MEMORY.
Address
(decimal)
255
32
31
3
2
1
0
Command: WRITE PROTECTION MEMORY
Binary
Hexadecimal
Semiconductor Group
:
:
Main Memory
Data Byte 255 (D7 … D0) –
:
Data Byte 32 (D7 … D0)
Data Byte 31 (D7 … D0)
:
Data Byte 3 (D7 … D0)
Data Byte 2 (D7 … D0)
Data Byte 1 (D7 … D0)
Data Byte 0 (D7 … D0)
B7
0
B6
0
B5
1
B4
1
Control
–
Protection Bit 31 (D31) –
:
Protection Bit 3 (D3)
Protection Bit 2 (D2)
Protection Bit 1 (D1)
Protection Bit 0 (D0)
Protection Memory
–
3C
H
B3
1
18
B2
1
B1
0
Security Memory
(only SLE 4442)
–
–
–
–
Reference Data Byte 3 (D7 … D0)
Reference Data Byte 2 (D7 … D0)
Reference Data Byte 1 (D7 … D0)
Error Counter
B0
0
Address
A7…A0
Address
00
H
…1F
H
Data
D7…D0
Input data
Input data
SLE 4432
SLE 4442