PM0020 datasheet(21/87 Pages) STMICROELECTRONICS

21 / 87 page

PM00020

STR91xFA Flash memory

21/87

1.11.3

ROTP read OTP sector (98h)

The OTP (one-time programmable) sector is the user configuration sector of bank 1 which

you can read using the ROTP command. It contains 16 halfwords and 15 are user-

programmable.

To read the OTP sector:

Write a Read OTP sector command (98h) to any word address in Bank 1.

Read any of the OTP words see Reading the OTP words can be non-sequential. To

access the OTP word, read from any address in Bank 1, using the low byte of the

address to select the word.

To exit ROTP mode, write a Read Array command (FFh) to any word address in Bank 1

to return it to Read Array mode.

1.11.4

RD read array (FFh)

Read array is the normal operating mode for reading application data or executing code

from a Flash bank. When a device reset occurs, the banks are in Read Array mode by

default. However when you write some CUI commands to the bank they change the

operating mode (for example to Program or Erase mode). When these operations are

completed, you use the Read Array command to put the bank back into Read Array mode. A

Read Array command will be ignored while a bank is programming or erasing. However in

the other bank, a Read Array command will be accepted.

To put the bank in Read Array mode:

●

Write a Read Array command (FFh) to any word address in the bank. The status of the

other bank is not affected by the command.

Protection Level 2 Register Bank 1

04h

xxxxxxxxh

Protection Level 1 Register Bank 0

05h

xxxxxxxxh

Protection Level 1 Register Bank 1

06h

xxxxxxxxh

Flash Configuration Register

07h

xxxxxxxxh

Table 8.

RSIG electronic signature data for STR91xFAxx6 and STR91xFAxx7

Code or register

Bank 1 word address LSB

Data D[31:0]

Table 9.

OTP word addressing

OTP word

Bank 1 word address LSB

OTP Word 0

00h

OTP Word 1

01h

OTP Word 2

02h

OTP Word 3

03h

OTP Word 4

04h

OTP Word 5

05h

OTP Word 6

06h

OTP Word 7

07h

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