MC9S12XS256RMV1 Datasheet, PDF (626/738 Pages) Freescale Semiconductor, Inc – Reference Manual

64 KByte Flash Module (S12XFTMR64K1V1)
Table 20-17. FPROT Field Descriptions
Field
Description
7
FPOPEN
Flash Protection Operation Enable — The FPOPEN bit determines the protection function for program or
erase operations as shown in Table 20-18 for the P-Flash block.
0 When FPOPEN is clear, the FPHDIS and FPLDIS bits define unprotected address ranges as specified by the
corresponding FPHS and FPLS bits
1 When FPOPEN is set, the FPHDIS and FPLDIS bits enable protection for the address range specified by the
corresponding FPHS and FPLS bits
6
Reserved Nonvolatile Bit — The RNV bit should remain in the erased state for future enhancements.
RNV[6]
5
FPHDIS
Flash Protection Higher Address Range Disable — The FPHDIS bit determines whether there is a
protected/unprotected area in a specific region of the P-Flash memory ending with global address 0x7F_FFFF.
0 Protection/Unprotection enabled
1 Protection/Unprotection disabled
4–3
Flash Protection Higher Address Size — The FPHS bits determine the size of the protected/unprotected area
FPHS[1:0] in P-Flash memory as shown inTable 20-19. The FPHS bits can only be written to while the FPHDIS bit is set.
2
FPLDIS
Flash Protection Lower Address Range Disable — The FPLDIS bit determines whether there is a
protected/unprotected area in a specific region of the P-Flash memory beginning with global address
0x7F_8000.
0 Protection/Unprotection enabled
1 Protection/Unprotection disabled
1–0
Flash Protection Lower Address Size — The FPLS bits determine the size of the protected/unprotected area
FPLS[1:0] in P-Flash memory as shown in Table 20-20. The FPLS bits can only be written to while the FPLDIS bit is set.
Table 20-18. P-Flash Protection Function
FPOPEN FPHDIS FPLDIS
Function¹
1
1
1
No P-Flash Protection
1
1
0
Protected Low Range
1
0
1
Protected High Range
1
0
0
Protected High and Low Ranges
0
1
1
Full P-Flash Memory Protected
0
1
0
Unprotected Low Range
0
0
1
Unprotected High Range
0
0
0
Unprotected High and Low Ranges
1 _{For range sizes, refer to Table 20-19 and Table 20-20.}
Table 20-19. P-Flash Protection Higher Address Range
FPHS[1:0]
00
01
10
11
Global Address Range
0x7F_F800–0x7F_FFFF
0x7F_F000–0x7F_FFFF
0x7F_E000–0x7F_FFFF
0x7F_C000–0x7F_FFFF
Protected Size
2 Kbytes
4 Kbytes
8 Kbytes
16 Kbytes
S12XS Family Reference Manual, Rev. 1.13
626
Freescale Semiconductor