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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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ST7263BEx bảng dữ liệu(PDF) 25 Page - STMicroelectronics |
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ST7263BEx bảng dữ liệu(HTML) 25 Page - STMicroelectronics |
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25 / 186 page  ST7263Bxx Flash program memory Doc ID 7516 Rev 8 25/186 4.3.1 Readout protection Readout protection, when selected, provides a protection against program memory content extraction and against write access to Flash memory. Even if no protection can be considered as totally unbreakable, the feature provides a very high level of protection for a general purpose microcontroller. In Flash devices, this protection is removed by reprogramming the option. In this case, the entire program memory is first automatically erased and the device can be reprogrammed. Readout protection selection depends on the device type: ● In Flash devices it is enabled and removed through the FMP_R bit in the option byte. ● In ROM devices it is enabled by mask option specified in the Option List. Figure 8. Memory map and sector address 4.4 ICC interface ICC (In-circuit communication) needs a minimum of four and up to six pins to be connected to the programming tool (see Figure 9). These pins are: ● RESET: device reset ● VSS: device power supply ground ● ICCCLK: ICC output serial clock pin ● ICCDATA: ICC input/output serial data pin ● ICCSEL/VPP: programming voltage ● OSC1(or OSCIN): main clock input for external source (optional) ● VDD: application board power supply (see Figure 9, Note 3) 4 Kbytes 4 Kbytes 2Kbytes SECTOR 1 SECTOR 0 16 Kbytes SECTOR 2 8K 16K 32K 60K FLASH FFFFh EFFFh DFFFh 3FFFh 7FFFh 1000h 24 Kbytes MEMORY SIZE 8Kbytes 40 Kbytes 52 Kbytes 9FFFh BFFFh D7FFh 4K 10K 24K 48K |
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