mc9s08gt32a Freescale Semiconductor, Inc, mc9s08gt32a Datasheet - Page 58

• Manufacturer Part Number: mc9s08gt32a
• Description: Hcs08 Microcontrollers 8-bit Microcontroller Family
• Manufacturer: Freescale Semiconductor, Inc

1
Chapter 4 Memory
4.6.3
Bits 7 through 5 may be read or written at any time. Bits 4 through 0 always read 0 and cannot be written.
4.6.4
During reset, the contents of the nonvolatile location NVPROT is copied from flash into FPROT. Bits 0,
1, and 2 are not used and each always reads as 0. This register may be read at any time, but user program
writes have no meaning or effect. Background debug commands can write to FPROT.
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Background commands can be used to change the contents of these bits in FPROT.
FPOPEN
KEYACC
Reset
Reset
Field
Field
5
7
W
W
R
R
FPOPEN
Flash Configuration Register (FCNFG)
Flash Protection Register (FPROT and NVPROT)
Enable Writing of Access Key — This bit enables writing of the backdoor comparison key. For more detailed
information about the backdoor key mechanism, refer to
0 Writes to 0xFFB0–0xFFB7 are interpreted as the start of a flash programming or erase command.
1 Writes to NVBACKKEY (0xFFB0–0xFFB7) are interpreted as comparison key writes.
Open Unprotected Flash for Program/Erase
0 Entire flash memory is block protected (no program or erase allowed).
1 Any flash location, not otherwise block protected or secured, may be erased or programmed.
(1)
0
0
7
7
Reads of the flash return invalid data.
= Unimplemented or Reserved
= Unimplemented or Reserved
FPDIS
(1)
0
0
6
6
This register is loaded from nonvolatile location NVPROT during reset.
Figure 4-6. Flash Configuration Register (FCNFG)
Figure 4-7. Flash Protection Register (FPROT)
Table 4-10. FPROT Field Descriptions
Table 4-9. FCNFG Field Descriptions
KEYACC
FPS2
MC9S08GB60A Data Sheet, Rev. 1.02
(1)
0
5
5
FPS1
(1)
0
0
4
4
Description
Description
Section 4.5,
FPS0
(1)
3
0
0
3
“Security.”
0
0
0
2
2
Freescale Semiconductor
0
0
0
1
1
0
0
0
0
0