LRI64_07 datasheet(34/52 Pages) STMICROELECTRONICS

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Command codes

LRI64

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18.3

Read Single Block

When receiving the Read Single Block Command, the LRI64 reads the requested block and

sends back its 8-bit value in the Response. The Option_Flag is supported. The Read Single

Block can be issued in both addressed and non addressed modes.

The Request Frame (Figure 26) contains:

●

Request Flags (Table 3 and Table 4)

●

Read Single Block Command Code (20h, Table 9)

●

Unique ID (Optional)

●

Block Number

●

2-byte CRC (Figure 15)

If there is no error, at the LRI64, the Response Frame (Figure 27) contains:

●

Response Flags (Table 6)

●

Block Locking Status, if Option_Flag is set

●

1 byte of Block Data (Table 10)

●

2-byte CRC (Figure 15)

Otherwise, if there is an error, the Response Frame (Figure 28) contains:

●

Response Flags (01h, Table 6)

●

Error Code (0Fh, Table 7)

●

2-byte CRC (Figure 15)

Figure 26.

Read Single Block, request frame format

Figure 27.

Read Single Block, response frame format, when Error_Flag is not set

Figure 28.

Read Single Block, response frame format, when Error_Flag is set

Table 10.

Block lock status

Bit

Name

Value

Description

Block Locked

Current Block not locked

Current Block locked

1 to 7

RFU

AI09732

Request

SOF

Request

Flags

Command

Code

UID

2-Byte

CRC

Request

EOF

8 bits

20h

64 bits

16 bits

Block

Number

8 bits

AI09733

Response

SOF

Response

Flags

BlockLock

Status

2-Byte

CRC

Response

EOF

8 bits

16 bits

Data

8 bits

AI09734

Response

SOF

Response

Flags

Error

Code

2-Byte

CRC

Response

EOF

8 bits

01h

8 bits

0Fh

16 bits

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