Chapter 27 512 KByte Flash Module (S12XFTM512K3V1)
MC9S12XE-Family Reference Manual , Rev. 1.19
1036
Freescale Semiconductor
Table 27-19. 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
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
RNV[6]
Reserved Nonvolatile Bit
— The RNV 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 P-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 bits determine the size of the protected/unprotected area
in P-Flash memory as shown in
. 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
FPLS[1:0]
Flash Protection Lower Address Size
— The FPLS bits determine the size of the protected/unprotected area
in P-Flash memory as shown in
. The FPLS bits can only be written to while the FPLDIS bit is set.
Table 27-20. P-Flash Protection Function
FPOPEN
FPHDIS
FPLDIS
Function
(1)
1. For range sizes, refer to
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
Table 27-21. P-Flash Protection Higher Address Range
FPHS[1:0]
Global Address Range
Protected Size
00
0x7F_F800–0x7F_FFFF
2 Kbytes
01
0x7F_F000–0x7F_FFFF
4 Kbytes
10
0x7F_E000–0x7F_FFFF
8 Kbytes
11
0x7F_C000–0x7F_FFFF
16 Kbytes
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages
