PC912XDP512F0MPVR datasheet(1198/1348 Pages) FREESCALE

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Chapter 29 128 Kbyte Flash Module (S12XFTX128K1V1)

MC9S12XDP512 Data Sheet, Rev. 2.21

1200

Freescale Semiconductor

Table 29-9. FPROT Field Descriptions

Field

Description

FPOPEN

Flash Protection Open — The FPOPEN bit determines the protection function for program or erase as shown

in Table 29-10.

0 The FPHDIS and FPLDIS bits deﬁne unprotected address ranges as speciﬁed by the corresponding

FPHS[1:0] and FPLS[1:0] bits. For an MCU without an EEPROM module, the FPOPEN clear state allows the

main part of the Flash block to be protected while a small address range can remain unprotected for EEPROM

emulation.

1 The FPHDIS and FPLDIS bits enable protection for the address range speciﬁed by the corresponding

FPHS[1:0] and FPLS[1:0] bits.

RNV6

Reserved Nonvolatile Bit — The RNV[6] bit should remain in the erased state for future enhancements.

FPHDIS

Flash Protection Higher Address Range Disable — The FPHDIS bit determines whether there is a

protected/unprotected area in a speciﬁc region of the Flash memory ending with global address 0x7F_FFFF.

0 Protection/Unprotection enabled.

1 Protection/Unprotection disabled.

4:3

FPHS[1:0]

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

area as shown inTable 29-11. The FPHS[1:0] bits can only be written to while the FPHDIS bit is set.

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 29-12. The FPLS[1:0] bits can only be written to while the FPLDIS bit is set.

Table 29-10. Flash Protection Function

FPOPEN

FPHDIS

FPLDIS

Function1

1 For range sizes, refer to Table 29-11 and Table 29-12.

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 29-11. 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

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