Chapter 21 64 KB Flash Module (S12ZFTMRZ64K2KV2)
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
Freescale Semiconductor
707
All possible P-Flash protection scenarios are shown in
. Although the protection scheme is
loaded from the Flash memory at global address 0xFF_FE0C during the reset sequence, it can be changed
by the user. The P-Flash protection scheme can be used by applications requiring reprogramming in single
chip mode while providing as much protection as possible if reprogramming is not required.
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
0xFF_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 21-20. P-Flash Protection Function
FPOPEN
FPHDIS
FPLDIS
Function
(1)
1. For range sizes, refer to
and
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 21-21. P-Flash Protection Higher Address Range
FPHS[1:0]
Global Address Range
Protected Size
00
0xFF_F800–0xFF_FFFF
2 KB
01
0xFF_F000–0xFF_FFFF
4 KB
10
0xFF_E000–0xFF_FFFF
8 KB
11
0xFF_C000–0xFF_FFFF
16 KB
Table 21-22. P-Flash Protection Lower Address Range
FPLS[1:0]
Global Address Range
Protected Size
00
0xFF_8000–0xFF_83FF
1 KB
01
0xFF_8000–0xFF_87FF
2 KB
10
0xFF_8000–0xFF_8FFF
4 KB
11
0xFF_8000–0xFF_9FFF
8 KB
Table 21-19. FPROT Field Descriptions (continued)
Field
Description
Содержание MC9S12ZVHL32
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