srt512 STMicroelectronics, srt512 Datasheet - Page 34

• Manufacturer Part Number: srt512
• Description: 13.56 Mhz Short-range Contactless Memory Chip With 512-bit Eeprom And Anticollision Functions
• Manufacturer: STMicroelectronics

SRT512 commands
8.7
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READ_BLOCK(Addr) command
Command Code = 08h
On receiving the READ_BLOCK command, the SRT512 reads the desired block and
returns the 4 data Bytes contained in the block. 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).
READ_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 SRT512 must have received a SELECT() command and be switched to SELECTED
state before any READ_BLOCK() command can be accepted. All READ_BLOCK()
commands sent to the SRT512 before a SELECT() command is issued are ignored.
Figure 39. READ_BLOCK request format
Request parameter:
Figure 40. READ_BLOCK response format
Response parameters:
Figure 41. READ_BLOCK frame exchange between Reader and SRT512
Reader
SRT512
SOF
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
SOF
SOF
08h
DATA 1
8 bIts
READ_BLOCK
ADDR
08h
CRC L CRC H EOF
DATA 2
8 bIts
ADDRESS
8 bIts
DATA 3
8 bIts
<-t 0 -> <-t 1 ->
SOF DATA
8 bits
DATA 4
CRC L
8 bIts
1
DATA
2
CRC L
8 bits
CRC H
DATA
8 bits
3
DATA
4
CRC H
8 bIts
CRC L CRC H EOF
EOF
SRT512
AI07684
AI13513b
EOF
AI07685