MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 53

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

4.9 FLASH Block Protect Register
MOTOROLA
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
U = Unaffected by reset. Initial value from factory is 1.
Write to this register is by a programming sequence to the FLASH memory.
Address:
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]
Reset:
Read:
Write:
FLASH BLOCK PROTECT
These eight bits in FLBPR represent bits [13:6] of a 16-bit memory
address. Bits [15:14] are logic 1s and bits [5:0] are logic 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
START ADDRESS OF
Figure 4-3. FLASH Block Protect Register (FLBPR)
$FFBE
BPR7
Bit 7
U
Figure 4-4. FLASH Block Protect Start Address
FLASH Memory (FLASH)
BPR6
6
U
1
1
BPR5
U
5
16-BIT MEMORY ADDRESS
BPR4
FLBPR VALUE
U
4
BPR3
U
3
Figure 4-4
FLASH Block Protect Register
BPR2
FLASH Memory (FLASH)
U
2
0
0
and
BPR1
0
U
1
Table
0
0
BPR0
Bit 0
4-1.
U
0
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