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ST92F120 データシート(PDF) 53 Page - STMicroelectronics

部品番号 ST92F120
部品情報  8/16-BIT FLASH MCU FAMILY WITH RAM, EEPROM AND J1850 BLPD
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92F120 データシート(HTML) 53 Page - STMicroelectronics

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ST92F120 - SINGLE VOLTAGE FLASH & EEPROM
3.5 EEPROM
3.5.1 Hardware EEPROM Emulation
Note: This section provides general information
only. Users do not have to be concerned with the
hardware EEPROM emulation.
The last 256 bytes of the two EEPROM dedicated
sectors (229000h to 2290FFh for sector E0 and
22D000h to 22D0FFh for sector E1) are reserved
for the Non Volatile pointers used for the hardware
Emulation.
When the EEPROM is directly addressed through
the addresses 220000h to 2203FFh, a Hardware
Emulation mechanism is automatically activated,
so avoiding the user having to manage the Non
Volatile pointers that are used to map the EEP-
ROM inside the two dedicated Flash sectors E0
and E1.
The structure of the hardware emulation is shown
in Figure 25.
Each one of the two EEPROM dedicated Flash
sectors E0 and E1 is divided in 4 blocks of the
same size of the EEPROM to emulate (1Kbyte
max).
Each one of the 4 blocks is then divided in up to 64
pages of 16 bytes, the size of the available RAM
buffer.
The RAM buffer is used internally to temporarily
store the new content of the page to update, dur-
ing the Page Program operation (both in Flash and
in EEPROM).
Figure 25. Segment 22h structure (Example for 128K Flash device).
229000h
220000h
2203FFh
Page buffer - 16 byte
64 pages
Flash/EEPROM sector F4/E0
Flash/EEPROM sector F5/E1
RAM buffer
HW emulated EEPROM
1 Kbyte
FCR, ECR, FESR1-0 - 4 byte
224000h
Page 63 - 16 byte
Page 0 - 16 byte
Page 1 - 16 byte
Page 62 - 16 byte
Page 2 to 61
228000h
Page 63 - 16 byte
Page 0 - 16 byte
Page 1 - 16 byte
Page 62 - 16 byte
Page 2 to 61
228400h
Page 63 - 16 byte
Page 0 - 16 byte
Page 1 - 16 byte
Page 62 - 16 byte
Page 2 to 61
228800h
Page 63 - 16 byte
Page 0 - 16 byte
Page 1 - 16 byte
Page 62 - 16 byte
Page 2 to 61
228C00h
Non Volatile Status
256 byte
22D000h
Page 63 - 16 byte
Page 0 - 16 byte
Page 1 - 16 byte
Page 62 - 16 byte
Page 2 to 61
22C000h
Page 63 - 16 byte
Page 0 - 16 byte
Page 1 - 16 byte
Page 62 - 16 byte
Page 2 to 61
22C400h
Page 63 - 16 byte
Page 0 - 16 byte
Page 1 - 16 byte
Page 62 - 16 byte
Page 2 to 61
22C800h
Page 63 - 16 byte
Page 0 - 16 byte
Page 1 - 16 byte
Page 62 - 16 byte
Page 2 to 61
22CC00h
Non Volatile Status
256 byte
User Registers
9


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