ST52F510 datasheet(33/106 Pages) STMICROELECTRONICS

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ST52F510/F513/F514

33/106

Figure 4.1 Commands and Data Communication Sequences

The generic procedure of commands execution,

with the data communication in both directions is

displayed in Figure 4.1.

Remark: the Slave Address 1010000 must be sent

after a Stop (i.e. each time the data direction

changes, to specify the R/W bit). For example: if a

command to send data to the device has been

executed, a command for receiving data must be

followed by the slave address and the R/W bit must

be set to 1. The Programming Mode code doesn’t

need to be specified again .

Warning: After entering the Programming Mode,

the currently pointed address is the Page 48, Block

3, byte 0 (Lock Byte).

The

list

the

available

commands

Programming Mode is showed in Table 4.2

4.2.2 Fast Programming procedure. The

fastest way to program the device memory is the

use of the

FastBlockWrite command. The following

procedure can be used to write the memory with a

new program and new data, starting from the first

memory location:

The Programming Mode is entered with the

sequence described above

The memory is erased (all bits are put to 0)

with the

GlobalErase command. The device

holds the SCL line low, releasing it after the

command is completed (about 2 ms). This

command also unlocks the device if locked.

The

FastBlockWrite command is sent and the

device acknowledges it

The 32 bytes of data to be written in the first

memory Block are sent in a sequence. The

device acknowledges each of them

After the device acknowledges the 32nd byte,

it holds the SCL line until the parallel writing of

the 32 byte is completed (about 2.5 ms)

The Block Pointer is incremented by sending

the

IncBlock command

The procedure is repeated from point 3 until

there is data to be sent to the memory

Note: the Block Pointer assumes values between

0 to 7 (there are 8 blocks in a page). When the

Block Pointer is equal to 7, the IncBlock command

puts this pointer to 0 and increments the Page

Pointer. The Page Pointer, after page writing is

completed, does’t have to be incremented in the

procedure above described.

4.2.3 Random data writing. A single byte can be

written in a specified memory location by using the

following procedure:

The Programming Mode is entered with the

sequence described in Section 4.2.1

The

SetPage command is sent, followed by

the page number where the data should be

written

The

ByteWrite command is sent followed by

two bytes

The first bytes that follows the ByteWrite com-

mand is the address inside the pointed page

where the data must be written.

The second byte is the data to be written

The device held the SCL line low until the data

is not stored in the memory (about 4.5 ms: 2

ms for erasing and 2.5 for writing)

Programming mode start sequence

Execution of commands for writing data:

Execution of commands for reading data:

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

From Slave to Master

From Master to Slave

S 10100000

00000000

Command

Data1

.....

DataN

Command

Data1

.....

DataN

Command

Data1

.....

DataN

Command

Address

S 10100001

Data read NA

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