s908gr32ag3vfa Freescale Semiconductor, Inc, s908gr32ag3vfa Datasheet - Page 43

• Manufacturer Part Number: s908gr32ag3vfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

2.6.2.2 FLASH-1 Block Protect Register
The FLASH-1 block protect register (FL1BPR) is implemented as a byte within the FLASH-1 memory;
therefore, it can only be written during a FLASH programming sequence. The value in this register
determines the starting location of the protected range within the FLASH-1 memory.
FL1BPR[7:0] — Block Protect Register Bits 7 to 0
Freescale Semiconductor
These eight bits represent bits [14:7] of a 16-bit memory address. Bit 15 is a 1 and bits [6:0] are 0s.
The resultant 16-bit address is used for specifying the start address of the FLASH-1 memory for block
protection. FLASH-1 is protected from this start address to the end of FLASH-1 memory at $FFFF.
With this mechanism, the protect start address can be $XX00 and $XX80 (128 byte page boundaries)
within the FLASH-1 array.
Address: $FF80
Read:
Write:
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
START ADDRESS OF FLASH
Figure 2-4. FLASH-1 Block Protect Register (FL1BPR)
BPR7
Bit 7
BLOCK PROTECT
Figure 2-5. FLASH-1 Block Protect Start Address
FL1BPR[7:0]
$FF
$FE
$FD
$0B
$0A
Table 2-2. FLASH-1 Protected Ranges
$09
$08
$04
$03
$02
$01
$00
BPR6
↓
↓
6
1
BPR5
5
FLBPR VALUE
16-BIT MEMORY ADDRESS
Unaffected by reset
BPR4
4
Protected Range
$FF00–$FFFF
$FE80–$FFFF
$8580–$FFFF
$8500–$FFFF
$8480–$FFFF
$8400–$FFFF
$8200–$FFFF
$8180–$FFFF
$8100–$FFFF
$8080–$FFFF
$8000–$FFFF
No protection
BPR3
3
↓
↓
0 0 0 0 0 0 0
BPR2
2
BPR1
1
FLASH-1 Memory (FLASH-1)
BPR0
Bit 0
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