SRT512 datasheet(35/46 Pages) STMICROELECTRONICS

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SRT512

SRT512 commands

Doc ID 13277 Rev 4

35/46

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:

●

Figure 13: Lockable EEPROM area (addresses 0 to 4)

●

Figure 14: Binary counter (addresses 5 to 6).

●

Figure 16: EEPROM (addresses 7 to 15).

The Write_block command does not give rise to a response from the SRT512. The reader

must check after the programming time, tW, that the data was correctly programmed. 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 43.

Write_block request format

Request parameters:

●

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.

Figure 44.

Write_block response format

Figure 45.

Write_block frame exchange between reader and SRT512

SOF

Data 1

CRCL

CRCH

EOF

AI07687c

8 bits

Data 2Data 3

Data 4

8 bIts8 bIts8 bIts8 bIts8 bIts

Write_block

Address

09h

8 bIts

AI07680b

No response

Data 1

AI13514d

Data 2Data 3 Data 4

Reader

SRT512

CRCL CRCH EOF

SOF

09h

Address

No response

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