MC9S08AC60 Datasheet, PDF (60/348 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 4 Memory
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
0
KEYACC
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 4-6. FLASH Configuration Register (FCNFG)
Table 4-9. FCNFG Field Descriptions
Field
Description
5
KEYACC
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 Section 4.5, “Security.”
0 Writes to $FFB0–$FFB7 are interpreted as the start of a FLASH programming or erase command.
1 Writes to NVBACKKEY ($FFB0–$FFB7) are interpreted as comparison key writes.
Reads of the FLASH return invalid data.
MC9S08AC60 Series Data Sheet, Rev. 2
60
Freescale Semiconductor