ST52F510 datasheet(36/106 Pages) STMICROELECTRONICS

36 / 106 page

ST52F510/F513/F514

36/106

4.3.2 Random data reading. To read a specified

memory location, the following procedure should

be used:

The Programming mode is entered with the

sequence described in Section 4.2.1

The

SetPage command is sent, followed to

the page number where the data to be read is

located

The

ByteRead command is sent, followed by

an address inside the page

The Master generates a Stop condition fol-

lowed by a Start condition

The Slave Address with the R/W byte set to 1

(10100001) is sent. The device receives the

Slave Address and acknowledges it.

The device sends the data to be read in the

serial data line SDA.

The Master device doesn’t send the acknowl-

edge and generates a stop condition.

To send the next command, the Master

should generate a Start condition followed by

the Slave Address with the R/W byte set to 0

(10100000).

Figure 4.4 Device Lock Procedure

4.4 Memory Lock

The Program/Data Memory space can be locked to

inhibit the reading of contents and protect the

intellectual property.

To lock the device, the user must set all the bit of

the Lock Byte to ‘1’. The Lock Byte is located on

Page 48 (030h), Block 3, byte 0 inside the block i.e.

byte 96 (060h) inside the page.

After writing 255 (0FFh) into the Lock Byte, with the

procedure described in the Section 4.2.3, the

memory is locked and the only command allowed

are the following:

–

GlobalErase: this command, writing ‘0’ in all the

memory, also unlock the device.

–

ReadData: the only block that can be read is the

Block 3 in Page 48 (030h); this allows the read-

ing of the Lock Byte and the ID Code locations

(see Section 4.5).

–

ReadStatus: this command allows the detection

of an error condition in Programming mode op-

eration (see Section 4.6). It can also be used to

check if the device is locked. The most significa-

tive bit return the Lock Bit (0=unlocked,

1=locked).

Remark: the Lock Byte is checked when entering

the Programming Mode. For this reason after

writing the Lock Byte, all the commands can be

carried out until the Programming mode is exited.

Device Lock Procedure

Device Lock and ID Code Writing Procedure

Device Lock Reading Procedure

(*) The most significative bit return the Lock Bit (0=unlocked, 1=locked)

S=Start, P=Stop, A=Acknowledge, NA=Non-acknowledge

From Slave to Master

From Master to Slave

.....

SetPage

00110000

ByteWrite

01100000

11111111

Command

.....

SetPage

00110000

IncBlock

BlockWrite

.....

11111111

ID Code 1

ID Code 2

.....

ID Code 31

Command

.....

ReadStatus

S 10100001

Status Byte (*) NA

S 10100000

Command .....

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