SRT512-SBN18/1G2 STMICROELECTRONICS [STMicroelectronics], SRT512-SBN18/1G2 Datasheet - Page 35

• Manufacturer Part Number: SRT512-SBN18/1G2
• Description: 13.56 MHz short-range contactless memory chip with 512-bit EEPROM and anticollision functions
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

SRT512
8.8
Write_block (Addr, Data) command
Command code = 09h
On receiving the Write_block command, the SRT512 writes the 4 bytes contained in the
command to the addressed block, provided that the block is available and not write-
protected. Data bytes are transmitted with the least significant byte first, and each byte is
transmitted with the least significant bit first.
The address byte gives access to the 16 blocks of the SRT512 (addresses 0 to 15).
Write_block commands issued with a block address above 15 will not be interpreted and the
SRT512 will not return any response, except for the System area located at address 255.
The result of the Write_block command is submitted to the addressed block. See the
following paragraphs for a complete description of the Write_block command:
●
●
●
The Write_block command does not give rise to a response from the SRT512. The reader
must check after the programming time, t
SRT512 must have received a Select() command and be switched to Selected state before
any Write_block command can be accepted. All Write_block commands sent to the SRT512
before a Select() command is issued, are ignored.
Figure 43. Write_block request format
Request parameters:
●
●
●
●
●
Figure 44. Write_block response format
Figure 45. Write_block frame exchange between reader and SRT512
SOF
Reader
SRT512
Figure 13: Lockable EEPROM area (addresses 0 to 4)
Figure 14: Binary counter (addresses 5 to
Figure 16: EEPROM (addresses 7 to
Address: block addresses from 0 to 15, or 255
Data 1: Less significant data byte
Data 2: Data byte
Data 3: Data byte
Data 4: Most significant data byte.
Write_block
SOF
09h
09h
Address
Address
8 bIts
Data 1
Doc ID 13277 Rev 4
Data 1
8 bIts
Data 2 Data 3 Data 4
No response
W
Data 2
15).
, that the data was correctly programmed. The
8 bIts
6).
Data 3
8 bIts
CRC L CRC H EOF
Data 4
8 bIts
CRC L
8 bits
SRT512 commands
No response
CRC H
8 bIts
AI13514d
AI07680b
AI07687c
EOF
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