ST52F510 datasheet(35/106 Pages) STMICROELECTRONICS

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ST52F510/F513/F514

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Figure 4.3 Reading and Erasing Procedures

4.3 Memory Verify

To verify the memory contents or just to read part

of data stored in memory, the

ByteRead and the

ReadData command can be used. The first

instruction needs the specification of the address;

the second one allows the sequential reading of

consecutive memory locations.

Since the device is “Slave” for the I2C protocol,

after receiving a command for reading, it must be

configured as Slave Transmitter to send the data.

In order to do so, the Slave Address (1010000)

must be sent again with the R/W byte set to 1, as

stated by the communication protocol.

4.3.1 Fast read procedure. The memory can be

read sequentially by using the following procedure:

The Programming mode is entered with the

sequence described in Section 4.2.1

The pointers address the memory location 0

The

ReadData command is sent and the de-

vice acknowledges it.

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 current absolute ad-

dress is post-incremented.

The Master device doesn’t send the acknowl-

edge and generates a stop condition.

To read the next data, the Master generates a

Start condition followed by the Slave Address

with the R/W byte set to 0 (10100000). The

device receives the Slave Address and ac-

knowledges it.

The sequence restarts from point 3 until there

is data to be read.

Remark: for the same reasons explained in

Section 4.2.4 the Option Bytes cannot be read with

this procedure: they can be read with a direct

addressing procedure as the one explained in the

next section.

Fast Reading Procedure

Random Byte Reading Procedure

Byte Erasing Procedure

Block Erasing Procedure

(*) Block address is specified by the 3 most significative bits of the whole given address (less significative bits are don’t care)

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

From Slave to Master

From Master to Slave

S 10100000

00000000

ReadData

S 10100001

Data read NA

.....

S 10100000

ReadData

S 10100001

Data read NA

.....

Data read NA

.....

SetPage

Page Address

ByteRead

Byte Address

S 10100001

.....

Data read NA

S 10100000

Command

.....

SetPage

Page Address

ByteErase

Byte Address

Command

.....

SetPage

Page Address

BlockErase

Block Address (*)

Command .....

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