srt512 STMicroelectronics, srt512 Datasheet - Page 35

• Manufacturer Part Number: srt512
• Description: 13.56 Mhz Short-range Contactless Memory Chip With 512-bit Eeprom And Anticollision Functions
• Manufacturer: 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
The 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 42. WRITE_BLOCK request format
Request parameters:
Figure 43. WRITE_BLOCK response format
SOF
Figure 12: Lockable EEPROM area (addresses 0 to 4)
Figure 13: Binary counter (addresses 5 to
Figure 15: 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
09h
ADDRESS
8 bIts
DATA 1
8 bIts
No Response
DATA 2
15).
8 bIts
6).
W
, that the data was correctly programmed.
DATA 3
8 bIts
DATA 4
8 bIts
CRC L
8 bits
SRT512 commands
CRC H
8 bIts
AI07680
AI07687
EOF
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