M34S32 datasheet(10/18 Pages) STMICROELECTRONICS

10 / 18 page

10/18

M34S32

If one bit of the Address bytes (excluding the three

most significant bits which are Don’t Care) differs

from the above values, the Address will be ac-

knowledged, data will not be acknowledged and

the WRITE instruction will be ignored.

The Page Write instruction must start with the first

byte that is located in the OTP page (address 0h),

otherwise the instruction will be ignored.

The first Write to the OTP page (whether it be a 1-

byte write, a 32-byte page write, or some size in

between) will disable any further write in the OTP

page.

Let us suppose that byte N of the OTP page has

just been addressed (for example because of a

Write in the OTP page or a Random read in the

OTP page). If the next instruction uses the Current

Read Mode of the device, the first byte read in

EEPROM will be in page 0, at address N+1 (or

page 1, byte 0 if the last OTP byte addressed was

at location 31).

Figure 9. Write Cycle Polling using ACK

WRITE Cycle

in Progress

AI02418

Operation is

Addressing the

Memory

START Condition

DEVICE SELECT

with RW = 0

ACK

Returned

YES

ReSTART

STOP

Proceed

WRITE Operation

Proceed

Random Address

READ Operation

Send

Byte Address

First byte of instruction

with RW = 0 already

decoded by M34Sxx

Example of a correct sequence, leading to a 3-

byte write in the OTP page:

Start

1010 0010

(OTP page select code)

Ack

1111 0000

(upper address, MSB)

Ack

0000 0000

(lower address, LSB)

Ack

0100 1101

(write 3 bytes of data)

Ack

(in the OTP page)

1100 1010

Ack

0101 0011

Ack

Stop

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