ST92F120 datasheet(40/324 Pages) STMICROELECTRONICS

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ST92F120 - SINGLE VOLTAGE FLASH & EEPROM

3.2 FUNCTIONAL DESCRIPTION

3.2.1 Structure

The Flash memory is composed of three parts

(see following table):

– 1 reserved sector for system routines (TestFlash

including user OTP area)

– 4 main sectors for code

– 2 sectors of the same size for EEPROM emula-

tion

The last 128 bytes of the TestFlash are available

to the user as an OTP area. The user can program

these bytes, but cannot erase them. The last 4

bytes of this OTP area (231FFCh to 231FFFh ) are

reserved for the Non-Volatile Protection registers

and cannot be used as a storage area (see Sec-

tion 3.6 PROTECTION STRATEGY for more de-

tails).

3.2.2 EEPROM Emulation

A hardware EEPROM emulation is implemented

using special flash sectors E0 and E1 to emulate

an EEPROM memory whose size is 1/4 of a sector

(1 Kbyte). This EEPROM can be directly ad-

dressed from 220000h to 2203FFh.

(see Section 3.5.1 Hardware EEPROM Emulation

for more details).

Table 7. Memory Structure for 128K Flash Device

Table 8. Memory Structure for 60K Flash Device

Sector

Addresses

Max Size

TestFlash (TF) (Reserved)

230000h to 231F7Fh

8064 bytes

OTP Area

Protection Registers (reserved)

231F80h to 231FFBh

231FFCh to 231FFFh

124 bytes

4 bytes

Flash 0 (F0)

000000h to 00FFFFh

64 Kbytes

Flash 1 (F1)

010000h to 01BFFFh

48 Kbytes

Flash 2 (F2)

01C000h to 01DFFFh

8 Kbytes

Flash 3 (F3)

01E000h to 01FFFFh

8 Kbytes

EEPROM 0 (E0)

228000h to 228FFFh

4 Kbytes

EEPROM 1 (E1)

22C000h to 22CFFFh

4 Kbytes

Emulated EEPROM

220000h to 2203FFh

1 Kbyte

Sector

Addresses

Max Size

TestFlash (TF) (Reserved)

230000h to 231F7Fh

8064 bytes

OTP Area

Protection Registers (reserved)

231F80h to 231FFBh

231FFCh to 231FFFh

124 bytes

4 bytes

Flash 0 (F0)

000000h to 000FFFh

4 Kbytes

Reserved

001000h to 00FFFFh

60 Kbytes

Flash 1 (F1)

010000h to 01BFFFh

48 Kbytes

Flash 2 (F2)

01C000h to 01DFFFh

8 Kbytes

EEPROM 0 (E0)

228000h to 228FFFh

4 Kbytes

EEPROM 1 (E1)

22C000h to 22CFFFh

4 Kbytes

Emulated EEPROM

220000h to 2203FFh

1Kbyte

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