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PC312XDP512F0CFVR Datasheet(PDF) 1119 Page - Freescale Semiconductor, Inc |
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PC312XDP512F0CFVR Datasheet(HTML) 1119 Page - Freescale Semiconductor, Inc |
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1119 / 1348 page ![]() Chapter 27 512 Kbyte Flash Module (S12XFTX512K4V2) MC9S12XDP512 Data Sheet, Rev. 2.21 Freescale Semiconductor 1121 27.3.2.5.1 Flash Protection Restrictions The general guideline is that Flash protection can only be added and not removed. Table 27-15 specifies all valid transitions between Flash protection scenarios. Any attempt to write an invalid scenario to the FPROT register will be ignored and the FPROT register will remain unchanged. The contents of the FPROT register reflect the active protection scenario. See the FPHS and FPLS descriptions for additional restrictions. 27.3.2.6 Flash Status Register (FSTAT) The FSTAT register defines the operational status of the module. Table 27-15. Flash Protection Scenario Transitions From Protection Scenario To Protection Scenario1 1 Allowed transitions marked with X. 01234567 0 XXXX 1 XX 2 XX 3 X 4 XX 5 XXXX 6 XX XX 7 XXXXXXXX 76543210 R CBEIF CCIF PVIOL ACCERR 0 BLANK 0 0 W Reset 11000000 = Unimplemented or Reserved Figure 27-12. Flash Status Register (FSTAT — Normal Mode) 76543210 R CBEIF CCIF PVIOL ACCERR 0 BLANK FAIL 0 W Reset 11000000 = Unimplemented or Reserved Figure 27-13. Flash Status Register (FSTAT — Special Mode) |
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