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ST72321BXXX-AUTO Datasheet(PDF) 36 Page - STMicroelectronics |
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ST72321BXXX-AUTO Datasheet(HTML) 36 Page - STMicroelectronics |
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36 / 247 page  Flash program memory ST72321Bxxx-Auto 36/247 4 Flash program memory 4.1 Introduction The ST7 dual voltage High Density Flash (HDFlash) is a non-volatile memory that can be electrically erased as a single block or by individual sectors and programmed on a byte-by- byte basis using an external VPP supply. The HDFlash devices can be programmed and erased off-board (plugged in a programming tool) or on-board using ICP (in-circuit programming) or IAP (in-application programming). The array matrix organization allows each sector to be erased and reprogrammed without affecting other sectors. 4.2 Main features ● 3 Flash programming modes: – Insertion in a programming tool. In this mode, all sectors including option bytes can be programmed or erased. – ICP (in-circuit programming). In this mode, all sectors including option bytes can be programmed or erased without removing the device from the application board. – IAP (in-application programming). In this mode, all sectors except Sector 0 can be programmed or erased without removing the device from the application board and while the application is running. ● ICT (in-circuit testing) for downloading and executing user application test patterns in RAM ● Readout protection ● Register Access Security System (RASS) to prevent accidental programming or erasing 4.3 Structure The Flash memory is organized in sectors and can be used for both code and data storage. Depending on the overall Flash memory size in the microcontroller device, there are up to three user sectors (see Table 4). Each of these sectors can be erased independently to avoid unnecessary erasing of the whole Flash memory when only a partial erasing is required. The first two sectors have a fixed size of 4 Kbytes (see Figure 5). They are mapped in the upper part of the ST7 addressing space so the reset and interrupt vectors are located in Sector 0 (F000h-FFFFh). Table 4. Sectors available in Flash devices Flash size (bytes) Available sectors 4K Sector 0 8K Sectors 0, 1 > 8K Sectors 0, 1, 2 |
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