mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 61

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

4.4.2.4
The FPROT register defines which flash sectors are protected against program or erase operations.
FPROT bits are readable and writable as long as the size of the protected fash memory is being increased.
Any write to FPROT that attempts to decrease the size of the protected flash memory will be ignored.
During the reset sequence, the FPROT register is loaded from the flash protection byte in the flash
configuration field (see
sequence, the flash sector containing the flash configuration field must be unprotected, then the flash
protection byte must be reprogrammed.
Trying to alter data in any protected area in the flash memory will result in a protection violation error and
the FPVIOL flag will be set in the FSTAT register. The mass erase of the flash array is not possible if any
of the flash sectors contained in the flash array are protected.
Freescale Semiconductor
FPOPEN
Reset
Field
FPS
7–1
0
W
R
Flash Protection Size — With FPOPEN set, the FPS bits determine the size of the protected flash address
range as shown in
Flash Protection Open
0 Flash array fully protected.
1 Flash array protected address range determined by FPS bits.
Flash Protection Register (FPROT and NVPROT)
F
7
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
Section
F
6
Table
Figure 4-6. Flash Protection Register (FPROT)
4.2.2). To change the flash protection that will be loaded during the reset
4-11.
Table 4-10. FPROT Field Descriptions
F
5
FPS
F
4
Description
F
3
F
2
F
1
FPOPEN
F
Memory
0
4-17