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ST92F120JR9T 数据表(PDF) 53 Page - STMicroelectronics |
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ST92F120JR9T 数据表(HTML) 53 Page - STMicroelectronics |
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53 / 320 page  53/320 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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