SRIX4K-SBN181GE STMICROELECTRONICS [STMicroelectronics], SRIX4K-SBN181GE Datasheet - Page 17

• Manufacturer Part Number: SRIX4K-SBN181GE
• Description: 13.56 MHz short-range contactless memory chip with 4096-bit EEPROM, anticollision and anti-clone functions
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

SRIX4K
4.3
Figure 17. Count down example (binary format)
The counter with block address 6 controls the Reload command used to reset the resettable
OTP area (addresses 0 to 4). Bits b
of these 11 bits is updated, the SRIX4K detects the change and adds an Erase cycle to the
Write_block command for locations 0 to 4 (see
Erase cycle remains active until a Power-off or a Select command is issued. The SRIX4K’s
resettable OTP area can be reloaded up to 2,047 times (2
EEPROM area
The 121 blocks between addresses 7 and 127 are EEPROM blocks of 32 bits each (484
bytes in total). (See
the Read_block and Write_block commands. The Write_block command for the EEPROM
area always includes an auto-erase cycle prior to the write cycle.
Blocks 7 to 15 can be write-protected. Write access is controlled by the 8 bits of the
OTP_Lock_Reg located at block address 255 (see
details). Once protected, these blocks (7 to 15) cannot be unprotected.
Initial data
1-unit decrement
1-unit decrement
1-unit decrement
8-unit decrement
Increment not allowed
Figure 18
b31
1
1
1
1
1
1
...
...
...
...
...
...
for a map of the area.) These blocks can be accessed using
1
1
1
1
1
1
31
1
1
1
1
1
1
to b
21
1
1
1
1
1
1
act as an 11-bit Reload counter; whenever one
1
1
1
1
1
1
Section 4.1: Resettable OTP
1
1
1
1
1
1
Section 4.4.1: OTP_Lock_Reg
1
1
1
1
1
1
11
1
1
1
1
1
1
-1).
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
Memory mapping
1
1
1
1
1
0
area). The
1
1
0
0
0
0
for
ai07661
1
0
1
0
0
0
b0
17/47