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MC908QT2ACDWE Datasheet(PDF) 34 Page - Freescale Semiconductor, Inc

No. de Pieza. MC908QT2ACDWE
Descripción  M68HC08 Microcontrollers
Descarga  200 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC908QT2ACDWE Datasheet(HTML) 34 Page - Freescale Semiconductor, Inc

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Memory
MC68HC908QYA/QTA Family Data Sheet, Rev. 3
34
Freescale Semiconductor
2.6.6 FLASH Block Protect Register
The FLASH block protect register is implemented as a byte within the FLASH memory, and therefore can
only be written during a programming sequence of the FLASH memory. The value in this register
determines the starting address of the protected range within the FLASH memory.
BPR[7:0] — FLASH Protection Register Bits [7:0]
These eight bits in FLBPR represent bits [13:6] of a 16-bit memory address. Bits [15:14] are 1s and
bits [5:0] are 0s.
The resultant 16-bit address is used for specifying the start address of the FLASH memory for block
protection. The FLASH is protected from this start address to the end of FLASH memory, at $FFFF.
With this mechanism, the protect start address can be XX00, XX40, XX80, or XXC0 within the FLASH
memory. See Figure 2-6 and Table 2-2.
Figure 2-6. FLASH Block Protect Start Address
Bit 7
654321
Bit 0
Read:
BPR7
BPR6
BPR5
BPR4
BPR3
BPR2
BPR1
BPR0
Write:
Reset:
Unaffected by reset. Initial value from factory is 1.
Write to this register is by a programming sequence to the FLASH memory.
Figure 2-5. FLASH Block Protect Register (FLBPR)
Table 2-2. Examples of Protect Start Address
BPR[7:0]
Start of Address of Protect Range
$00–$B8
The entire FLASH memory is protected.
$B8 (1011 1000)
$EE00 (1110 1110 0000 0000)
$B9 (1011 1001)
$EE40 (1110 1110 0100 0000)
$BA (1011 1010)
$EE80 (1110 1110 1000 0000)
$BB (1011 1011)$EFC0 (1110 1110 1100 0000)
and so on...
$DE (1101 1110)$F780 (1111 0111 1000 0000)
$DF (1101 1111)$F7C0 (1111 0111 1100 0000)
$FE (1111 1110)
$FF80 (1111 1111 1000 0000)
FLBPR, internal oscillator trim values, and vectors are protected
$FF
The entire FLASH memory is not protected.
0
0
0
0
0
1
1
FLBPR VALUE
START ADDRESS OF
16-BIT MEMORY ADDRESS
FLASH BLOCK PROTECT
0


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