AN2400 Freescale Semiconductor / Motorola, AN2400 Datasheet - Page 26

• Manufacturer Part Number: AN2400
• Description: HCS12 NVM Guidelines
• Manufacturer: Freescale Semiconductor / Motorola

AN2400/D
26
NOTE:
FPOPEN — Flash Protection Open
On some microcontrollers, the FPHDIS, FPHS[1:0], FPLDIS and FPLS[1:0] bits
do have an effect on the selection of the protected Flash areas when
FPOPEN = 0. Refer to the relevant Flash Block Guide for details.
FPHDIS — Flash Protection High address range Disable.
FPHS[1:0] — Flash Protection High address Size.
FPLDIS — Flash Protection Low address range Disable.
FPLS[1:0] — Flash Protection Low address Size.
The FPHS[1:0] bits determine the size of the high address range protected
area.
64k byte Flash Block.
The FPLS[1:0] bits determine the size of the low address range protected
area.
64k byte Flash Block.
Freescale Semiconductor, Inc.
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1 = The Flash block protection depends on the FPHDIS, FPHS[1:0],
0 = The entire Flash block is protected against programming and erasure.
1 = The high address range protection is disabled.
0 = The high address range protection is enabled and the size of the
1 = The low address range protection is disabled.
0 = The low address range protection is enabled and the size of the
Table 5. Flash Protection High Bits
Table 6. Flash Protection Low Bits
FPLDIS and FPLS[1:0] bits.
The FPHDIS, FPHS[1:0], FPLDIS and FPLS[1:0] bits have no effect.
protected area depends on the FPHS[1:0] bits.
protected area depends on the FPLS[1:0] bits.
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HCS12 NVM Guidelines
Table 5. Flash Protection High Bits
Table 6. Flash Protection Low Bits
FPHS[1:0]
FPLS[1:0]
00
01
10
11
00
01
10
11
Protected Size (64k
Protected Size (64k
512 bytes
16k bytes
2k bytes
4k bytes
8k bytes
1k bytes
2k bytes
4k bytes
Block)
Block)
gives the available sizes for a
gives the available sizes for a
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