MC68HC908JG16FA MOTOROLA [Motorola, Inc], MC68HC908JG16FA Datasheet - Page 64
MC68HC908JG16FA
Manufacturer Part Number
MC68HC908JG16FA
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908JG16FA.pdf
(324 pages)
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FLASH Memory
4.8 FLASH Protection
4.8.1 FLASH Block Protect Register
Technical Data
64
NOTE:
Address:
Due to the ability of the on-board charge pump to erase and program the
FLASH memory in the target application, provision is made to protect
blocks of memory from unintentional erase or program operations due to
system malfunction. This protection is done by use of a FLASH Block
Protect Register (FLBPR). The FLBPR determines the range of the
FLASH memory which is to be protected. The range of the protected
area starts from a location defined by FLBPR and ends to the bottom of
the FLASH memory ($FFFF). When the memory is protected, the HVEN
bit cannot be set in either ERASE or PROGRAM operations.
When the FLBPR is cleared (all 0’s), the entire FLASH memory is
protected from being programmed and erased. When all the bits are set,
the entire FLASH memory is accessible for program and erase.
The FLASH block protect register is implemented as an 8-bit I/O register.
The 7 bits of the 8-bit content of this register determine the starting
location of the protected range within the FLASH memory.
BPR[7:0] — FLASH Block Protect Register Bit 7 to Bit 0
Reset:
Read:
Write:
Start address of FLASH block protect
BPR[7:1] represent bits [15:9] of a 16-bit memory address; bits [8:0]
are logic 0’s.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 4-4. FLASH Block Protect Register (FLBPR)
$FE09
BPR7
Bit 7
0
Figure 4-5. FLASH Block Protect Start Address
Go to: www.freescale.com
BPR6
FLASH Memory
6
0
BPR5
5
0
BPR4
4
0
BPR[7:1]
BPR3
3
0
16-bit memory address
MC68HC908JG16
BPR2
2
0
0 0 0 0 0 0 0 0 0
BPR1
1
0
MOTOROLA
—
Rev. 1.0
BPR0
Bit 0
0
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