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MC9S08QD4CSC Datasheet(PDF) 47 Page - Freescale Semiconductor, Inc |
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MC9S08QD4CSC Datasheet(HTML) 47 Page - Freescale Semiconductor, Inc |
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47 / 198 page  Chapter 4 Memory Map and Register Definition MC9S08QD4 Series MCU Data Sheet, Rev. 6 Freescale Semiconductor 47 4.7.3 Flash Configuration Register (FCNFG) 4.7.4 Flash Protection Register (FPROT and NVPROT) During reset, the contents of the nonvolatile location NVPROT is copied from flash into FPROT. This register can be read at any time, but user program writes have no meaning or effect. 76 54 321 0 R0 0 KEYACC 00 000 W Reset 000 00 000 = Unimplemented or Reserved Figure 4-7. Flash Configuration Register (FCNFG) Table 4-10. FCNFG Register Field Descriptions Field Description 5 KEYACC Enable Writing of Access Key — This bit enables writing of the backdoor comparison key. For more detailed information about the backdoor key mechanism, refer to Section 4.6, “Security.” 0 Writes to 0xFFB0–0xFFB7 are interpreted as the start of a flash programming or erase command. 1 Writes to NVBACKKEY (0xFFB0–0xFFB7) are interpreted as comparison key writes. 76 54 321 0 R FPS(1) FPDIS(1) W Reset This register is loaded from nonvolatile location NVPROT during reset. 1 Background commands can be used to change the contents of these bits in FPROT. Figure 4-8. Flash Protection Register (FPROT) Table 4-11. FPROT Register Field Descriptions Field Description 7:1 FPS Flash Protect Select Bits — When FPDIS = 0, this 7-bit field determines the ending address of unprotected flash locations at the high address end of the flash. Protected flash locations cannot be erased or programmed. 0 FPDIS Flash Protection Disable 0 Flash block specified by FPS7:FPS1 is block protected (program and erase not allowed). 1 No flash block is protected. |
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