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NRF52811-QCAA-R Arkusz danych(PDF) 83 Page - Nordic Semiconductor |
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NRF52811-QCAA-R Arkusz danych(HTML) 83 Page - Nordic Semiconductor |
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83 / 444 page ![]() Peripherals Non-volatile memory can be protected from erases and writes depending on the settings in the CONFIG registers. One bit in a CONFIG register represents one protected block of 4 kB. There are multiple CONFIG registers to cover the whole range of the flash. Protected regions of program memory on page 83 illustrates how the CONFIG bits map to the program memory space. Important: If an erase or write to a protected block is detected, the CPU will hard fault. If an ERASEALL operation is attempted from the CPU while any block is protected, it will be blocked and the CPU will hard fault. On reset, all the protection bits are cleared. To ensure safe operation, the first task after reset must be to set the protection bits. The only way of clearing protection bits is by resetting the device from any reset source. The protection mechanism is turned off when in debug mode (when a debugger is connected) and the DISABLEINDEBUG register is set to disabled. ... 0 1 2 n*32 + 31 n*32 + 1 n*32 + 0 Program memory 0x00000000 0 CONFIG[0] l 31 0 CONFIG[n] l 31 Figure 25: Protected regions of program memory 4454_140 v1.0 83 |
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