MC9S12XD256MAL Datasheet, PDF (1198/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network

Chapter 29 128 Kbyte Flash Module (S12XFTX128K1V1)
Table 29-9. FPROT Field Descriptions
Field
Description
7
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.
6
RNV6
Reserved Nonvolatile Bit — The RNV[6] bit should remain in the erased state for future enhancements.
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 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[1:0] bits determine the size of the protected/unprotected
FPHS[1:0] area as shown inTable 29-11. The FPHS[1:0] 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 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[1:0] bits determine the size of the protected/unprotected
FPLS[1:0] 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
1
1
No 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 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 29-11 and Table 29-12.
Table 29-11. 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
1200
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor