MC68HC908AZ60A_13 Datasheet, PDF (63/414 Pages) Freescale Semiconductor, Inc – Microcontrollers

FLASH-2 Control and Block Protect Registers
Address: $FF81
Bit 7
6
5
4
3
2
1
Bit 0
Read:
BPR7
Write:
BPR6
BPR5
BPR4
BPR3
BPR2
BPR1
BPR0
Figure 5-2. FLASH-2 Block Protect Register (FL2BPR)
NOTE
The FLASH-2 Block Protect Register (FL2BPR) controls the block
protection for the FLASH-2 array. However, FL2BPR is implemented within
the FLASH-1 memory array and therefore, the FLASH-1 Control Register
(FL1CR) must be used to program/erase FL2BPR.
FL2BPR[7:0] — Block Protect Register Bit 7 to Bit 0
These eight bits represent bits [14:7] of a 16-bit memory address. Bit 15 is logic 1 and bits [6:0] are
logic 0s.
The resultant 16-bit address is used for specifying the start address of the FLASH-2 memory for block
protection. FLASH-2 is protected from this start address to the end of FLASH-2 memory at $7FFF.
With this mechanism, the protect start address can be $XX00 and $XX80 (128 byte page boundaries)
within the FLASH-2 array.
Start address of FLASH block protect 1
16-bit memory address
FLBPR value
0000000
Figure 5-3. FLASH-2 Block Protect Start Address
FLASH-2 Protected Ranges:
FL2BPR[7:0]
$FF
$FE
$FD
Protected Range
No Protection
$7F00 – $7FFF
$7E80 – $7FFF
$0B
$0580 – $7FFF
$0A
$0500 – $7FFF
$09
$0480 – $7FFF
$08
$0450 – $7FFF
$04
$0450 – $7FFF
$03
$0450 – $7FFF
$02
$0450 – $7FFF
$01
$0450 – $7FFF
$00
$0450 – $7FFF
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
Freescale Semiconductor
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