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AT90SCR100 Datasheet(PDF) 366 Page - ATMEL Corporation |
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AT90SCR100 Datasheet(HTML) 366 Page - ATMEL Corporation |
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366 / 433 page  366 TPR0327AY–SMS–30Jan09 AT90SCR100 28.4 Boot Loader Lock Bits If no Boot Loader capability is needed, the entire Flash is available for application code. The Boot Loader has two separate sets of Boot Lock bits which can be set independently. This gives the user a unique flexibility to select different levels of protection. The user can select: • To protect the entire Flash from a software update by the MCU. • To protect only the Boot Loader Flash section from a software update by the MCU. • To protect only the Application Flash section from a software update by the MCU. • Allow software update in the entire Flash. See Table 28-2 and Table 28-3 for further details. The Boot Lock bits can be set in software and in Serial Pogramming mode, but they can be cleared by a Chip Erase command only. The gen- eral Write Lock (Lock Bit mode 2) does not control the programming of the Flash memory by SPM instruction. Similarly, the general Read/Write Lock (Lock Bit mode 1) does not control read- ing nor writing by (E)LPM/SPM, if it is attempted. Note: 1. “1” means unprogrammed, “0” means programmed Table 28-2. Boot Lock Bit0 Protection Modes (Application Section)(1) BLB0 Mode BLB02 BLB01 Protection 11 1 No restrictions for SPM or (E)LPM accessing the Application section. 2 1 0 SPM is not allowed to write to the Application section. 30 0 SPM is not allowed to write to the Application section, and (E)LPM executing from the Boot Loader section is not allowed to read from the Application section. If Interrupt Vectors are placed in the Boot Loader section, interrupts are disabled while executing from the Application section. 40 1 (E)LPM executing from the Boot Loader section is not allowed to read from the Application section. If Interrupt Vectors are placed in the Boot Loader section, interrupts are disabled while executing from the Application section. Table 28-3. Boot Lock Bit1 Protection Modes (Boot Loader Section)(1) BLB1 Mode BLB12 BLB11 Protection 11 1 No restrictions for SPM or (E)LPM accessing the Boot Loader section. 2 1 0 SPM is not allowed to write to the Boot Loader section. 30 0 SPM is not allowed to write to the Boot Loader section, and (E)LPM executing from the Application section is not allowed to read from the Boot Loader section. If Interrupt Vectors are placed in the Application section, interrupts are disabled while executing from the Boot Loader section. 40 1 (E)LPM executing from the Application section is not allowed to read from the Boot Loader section. If Interrupt Vectors are placed in the Application section, interrupts are disabled while executing from the Boot Loader section. |
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