SR176_07 datasheet(20/35 Pages) STMICROELECTRONICS

20 / 35 page

Device operations (instructions)

SR176

20/35

5.6

WRITE_BLOCK

Command Code = 09h,(X.AD)

Prior to any WRITE_BLOCK command, the SR176 must have been set into the SELECTED

state.

When executing the WRITE_BLOCK command, the SR176 overwrites the contents of the

addressed block with the 16-bit value that was sent in the command, provided that the block

is available and not write protected. The AD value of the four least significant bits of the

address code (X.AD) (b3 to b0) represents the block address. For example, address 06h

specifies that the data should be written in block 6. The SR176 does not generate any

response when it executes a WRITE_BLOCK command (Figure 30). The reader must check

after the programming time, tW, that the data bits were correctly programmed.

Block addresses between 0 to 3 cannot be accessed using the WRITE_BLOCK command

(the command has no effect on these blocks). Write access to block 15 is described in the

section on the PROTECT_BLOCK command.

Request parameters (Figure 29):

●

ADDRESS: address block from 4 to 14

●

DATAL: least significant Byte

●

DATAH: most significant Byte

Figure 29.

WRITE_BLOCK request format

Figure 30.

WRITE_BLOCK frame exchange between Reader and SR176

SOF

DATAL

CRCL

CRCH

EOF

AI07709B

DATAH

8 bIts

WRITE_BLOCK

ADDRESS

09h

4 zero-bits

+ 4-bit address

DATAL

AI07710B

DATAH

Reader

SR176

CRCL CRCH EOF

SOF

09h

ADDR

No Response

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