PM0020 datasheet(20/87 Pages) STMICROELECTRONICS

20 / 87 page

STR91xFA Flash memory

PM00020

20/87

1.11

Read operations

1.11.1

RSR read bank status register (70h)

Each bank has a Bank Status Register which indicates when a program or erase operation

is completed and the success or error status. Refer to Section 1.13.1 for the register

description.

To read the Bank Status Register:

Write a Read Status Register command (70h) to any word address in the bank. The

status of the other bank is not affected by the command. You can write a Read Status

Read any address in the bank to obtain the content of the Status Register.

See also Section 1.12.3: CLSR clear status register (50h).

1.11.2

RSIG read electronic signature (90h)

The Electronic Signature is stored in the user configuration sector of Bank 1 which you can

read using the RSIG command. It contains factory-programmed identification data that is

useful to allow other devices to automatically match their interface to the characteristics of

the microcontroller. The RSIG sector also contains Sector protection and Flash

Configuration registers.

To read the Electronic Signature content:

Write a Read Electronic Signature command (90h) to any word address in Bank 1.

Read any of the RSIG registers shown in Table 7 Reading the RSIG locations can be

non-sequential. To access the RSIG registers, read from any address in Bank 1, using

the low byte of the address to select the register.

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

to return it to Read Array mode.

Table 7.

RSIG electronic signature data for STR91xFAxx2 and STR91xFAxx4

Code or register

Bank 1 word address LSB

Data D[31:0]

Manufacturer Code

00h

20h

Device Code

01h

04570041h

Die Revision Code

02h

xxxx0000h

Protection Level 2 Register

03h

xxxxxxxxh

Protection Level 1 Register

04h

xxxxxxxxh

Flash Configuration Register

05h

xxxxxxxxh

Table 8.

RSIG electronic signature data for STR91xFAxx6 and STR91xFAxx7

Code or register

Bank 1 word address LSB

Data D[31:0]

Manufacturer Code

00h

20h

Device Code

01h

04570041h

Die Revision Code

02h

xxxx0000h

Protection Level 2 Register Bank 0

03h

xxxxxxxxh

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