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MC9S08SG8 Datasheet(PDF) 56 Page - Freescale Semiconductor, Inc |
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MC9S08SG8 Datasheet(HTML) 56 Page - Freescale Semiconductor, Inc |
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56 / 316 page  Chapter 4 Memory MC9S08SG8 MCU Series Data Sheet, Rev. 6 55 Freescale Semiconductor 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. Figure 4-8. FLASH Protection Register (FPROT) Table 4-9. Security States1 1 SEC01:SEC00 changes to 1:0 after successful backdoor key entry or a successful blank check of FLASH. SEC01:SEC00 Description 0:0 secure 0:1 secure 1:0 unsecured 1:1 secure 76543210 R0 0 KEYACC 00000 W Reset 00000000 = 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. 76543210 R FPS(1) 1 Background commands can be used to change the contents of these bits in FPROT. FPDIS(1) W Reset This register is loaded from nonvolatile location NVPROT during reset. |
Similar Part No. - MC9S08SG8 |
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Similar Description - MC9S08SG8 |
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