mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 94

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 2 256 Kbyte Flash Module (FTS256K2V1)
All possible Flash protection scenarios are illustrated in
loaded from the Flash array after reset, it can be changed by the user. This protection scheme can be used
by applications requiring re-programming in single-chip mode while providing as much protection as
possible if re-programming is not required.
94
FPLS[1:0]
FPHS[1:0]
FPLS[1:0]
FPLDIS
Field
1:0
2
00
01
10
11
00
01
10
11
Flash Protection Lower address range Disable — The FPLDIS bit determines whether there is a
protected/unprotected area in the lower address space of the Flash block.
0 Protection/Unprotection enabled
1 Protection/Unprotection disabled
Flash Protection Lower Address Size — The FPLS[1:0] bits determine the size of the protected/unprotected
area as shown in
1
For range sizes, refer to
FPOPEN
1
1
1
1
0
0
0
0
0xF800–0xFFFF
0xF000–0xFFFF
0xE000–0xFFFF
0xC000–0xFFFF
Address Range
Address Range
0x4000–0x4FFF
0x4000–0x5FFF
0x4000–0x43FF
0x4000–0x47FF
Table
Table 2-13. Flash Protection Higher Address Range
Table 2-14. Flash Protection Lower Address Range
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Table 2-11. FPROT Field Descriptions (continued)
FPHDIS
2-14. The FPLS[1:0] bits can only be written to while the FPLDIS bit is set.
Table 2-12. Flash Protection Function
1
1
0
0
1
1
0
0
MC9S12E256 Data Sheet, Rev. 1.08
Table 2-13
FPLDIS
1
0
1
0
1
0
1
0
and
Table
No Protection
Protected Low Range
Protected High Range
Protected High and Low Ranges
Full Block Protected
Unprotected Low Range
Unprotected High Range
Unprotected High and Low Ranges
Description
0x0037/0x003F: 0xC800–0xCFFF
0x0037/0x003F: 0xC000–0xCFFF
0x0037/0x003F: 0xB000–0xCFFF
0x0037/0x003F: 0x8000–0xCFFF
0x0036/0x003E: 0x8000–0x83FF
0x0036/0x003E: 0x8000–0x87FF
0x0036/0x003E: 0x8000–0x8FFF
0x0036/0x003E: 0x8000–0x9FFF
2-14.
Figure
Address Range
Address Range
2-9. Although the protection scheme is
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Function
1
Freescale Semiconductor
Protected Size
Protected Size
16 Kbytes
2 Kbytes
4 Kbytes
8 Kbytes
2 Kbytes
4 Kbytes
8 Kbytes
1 Kbyte