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ST72411T1 Datasheet(PDF) 11 Page - STMicroelectronics |
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ST72411T1 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 71 page ST72411R 11/71 FLASH PROGRAM MEMORY (Cont’d) ISP2 Mode This mode requires five signals (plus the VDD sig- nal if necessary) to be connected to the program- ming tool. These signals are: – RESET: device reset –VSS: device ground power supply – ISPCLK2: ISP output serial clock pin – ISPDATA2: ISP input serial data pin – ISPSEL: Remote ISP mode selection. This pin must be left high impedance (internal pull down on pin ISPSEL) if the internal oscillator is selected. Otherwise an appropriate pull-up is needed (see Electrical Characteristics). If any of these pins are used for other purposes on the application, a serial resistor has to be imple- mented to avoid a conflict if the other device forces the signal level. Figure 4 shows a typical hardware interface to a standard ST7 programming tool. For more details on the pin locations, refer to the device pinout de- scription. Figure 4. Typical Remote ISP2 Interface 1.5 Program Memory Read-out Protection The read-out protection is enabled through an op- tion bit. For FLASH devices, when this option is selected, the program and data stored in the FLASH memo- ry are protected against read-out piracy (including a re-write protection). When this protection option is removed the entire FLASH program memory is automatically erased. ISPSEL VSS RESET ISPCLK2 ISPDATA 2 ST7 HE10 CONNECTOR TYPE TO PROGRAMMING TOOL APPLICATION 4.7k Ω 1 |
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