SC312XDP512F0MPVR datasheet(1117/1348 Pages) FREESCALE

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Chapter 27 512 Kbyte Flash Module (S12XFTX512K4V2)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

1119

All possible Flash protection scenarios are shown in Figure 27-11. Although the protection scheme is

loaded from the Flash array at global address 0x7F_FF0D during the reset sequence, it can be changed by

the user. This protection scheme can be used by applications requiring re-programming in single chip

mode while providing as much protection as possible if re-programming is not required.

FPLDIS

Flash Protection Lower Address Range Disable — The FPLDIS bit determines whether there is a

protected/unprotected area in a speciﬁc region of the Flash memory beginning with global address 0x7F_8000.

0 Protection/Unprotection enabled.

1 Protection/Unprotection disabled.

1–0

FPLS[1:0]

Flash Protection Lower Address Size — The FPLS[1:0] bits determine the size of the protected/unprotected

area as shown in Table 27-14. The FPLS[1:0] bits can only be written to while the FPLDIS bit is set.

Table 27-12. Flash Protection Function

FPOPEN

FPHDIS

FPLDIS

Function1

1 For range sizes, refer to Table 27-13 and Table 27-14.

No Protection

Protected Low Range

Protected High Range

Protected High and Low Ranges

Full Flash memory Protected

Unprotected Low Range

Unprotected High Range

Unprotected High and Low Ranges

Table 27-13. Flash Protection Higher Address Range

FPHS[1:0]

Global

Address Range

Protected Size

0x7F_F800–0x7F_FFFF

2 Kbytes

0x7F_F000–0x7F_FFFF

4 Kbytes

0x7F_E000–0x7F_FFFF

8 Kbytes

0x7F_C000–0x7F_FFFF

16 Kbytes

Table 27-14. Flash Protection Lower Address Range

FPLS[1:0]

Global

Address Range

Protected Size

0x7F_8000–0x7F_83FF

1 Kbytes

0x7F_8000–0x7F_87FF

2 Kbytes

0x7F_8000–0x7F_8FFF

4 Kbytes

0x7F_8000–0x7F_9FFF

8 Kbytes

Table 27-11. FPROT Field Descriptions (continued)

Field

Description

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