s908ab32ag0cfue Freescale Semiconductor, Inc, s908ab32ag0cfue Datasheet - Page 66

• Manufacturer Part Number: s908ab32ag0cfue
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

FLASH Memory
4.8.1 FLASH Block Protect Register
Technical Data
66
Address:
The FLASH block protect register (FLBPR) 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 location of the protected range within the FLASH
memory.
BPR[7:0] — FLASH Block Protect Bits
Reset:
Read:
Write:
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 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 and XX80
(128 bytes page boundaries) within the FLASH memory.
Start address of FLASH block protect
U = Unaffected by reset. Initial value from factory is 1.
Write to this register is by a programming sequence to the FLASH memory.
Figure 4-3. FLASH Block Protect Register (FLBPR)
$FF7E
BPR7
Bit 7
U
Figure 4-4. FLASH Block Protect Start Address
BPR6
FLASH Memory
U
6
BPR5
U
5
1
BPR4
U
4
FLBPR value
16-bit memory address
BPR3
U
3
MC68HC908AB32
BPR2
Freescale Semiconductor
U
2
0 0 0 0 0 0 0
BPR1
U
1
—
Rev. 1.1
BPR0
Bit 0
U