PC912XDP512F0CFVR datasheet(1201/1348 Pages) FREESCALE

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Chapter 29 128 Kbyte Flash Module (S12XFTX128K1V1)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

1203

29.3.2.5.1

Flash Protection Restrictions

The general guideline is that Flash protection can only be added and not removed. Table 29-13 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.

29.3.2.6

Flash Status Register (FSTAT)

The FSTAT register defines the operational status of the module.

Table 29-13. Flash Protection Scenario Transitions

From

Protection Scenario

To Protection Scenario1

1 Allowed transitions marked with X.

01234567

XXXX

XXXXXXXX

76543210

CBEIF

CCIF

PVIOL

ACCERR

BLANK

Reset

11000000

= Unimplemented or Reserved

Figure 29-10. Flash Status Register (FSTAT — Normal Mode)

76543210

CBEIF

CCIF

PVIOL

ACCERR

BLANK

FAIL

Reset

11000000

= Unimplemented or Reserved

Figure 29-11. Flash Status Register (FSTAT — Special Mode)

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