mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 55

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

0x(FF)FF_98C8–
0x(FF)FF_98A0–
0x(FF)FF_98B0–
0x(FF)FF_98AF
0x(FF)FF_98BF
0x(FF)FF_98C0
0x(FF)FF_98C1
0x(FF)FF_98C2
0x(FF)FF_98C3
0x(FF)FF_98C4
0x(FF)FF_98C5
0x(FF)FF_98C6
0x(FF)FF_98C7
0x(FF)FF_98CF
4.2.2
Several reserved flash memory locations, shown in
corresponding peripheral registers. These registers include an 8-byte backdoor key which can be used to
gain access to secure memory resources. During reset events, the contents of the flash protection
(NVPROT) byte and flash nonvolatile (NVOPT) byte in the reserved flash memory are transferred into the
corresponding FPROT and FOPT registers in the high-page register area to control security and block
protection options.
Table 4-4
further details.
The 1 kHz oscillator, bandgap, and MCG trim values are stored in the IFR
will automatically be loaded from the IFR into the MCGTRM and MCGSC registers after any reset. The
Freescale Semiconductor
0x(FF)FF_989E
0x(FF)FF_989F
Address
0x(00)00_03FC
0x(00)00_040C
0x(00)00_0400
0x(00)00_0404
0x(00)00_0408
Address
reflects the fact that ColdFire uses big endian addressing. See the ColdFire documentation for
Flash Module Reserved Memory Locations
CANIDMR6
CANIDMR7
MSCAN Rx
MSCAN Tx
Reserved
Reserved
Reserved
CRCL0
CRCL1
CRCL2
CRCL3
Buffer
Buffer
CRCH
CRCL
Name
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
Table 4-3. High-Page Equivalent Register Summary (Sheet 4 of 4)
Table 4-4. Reserved Flash Memory Addresses
Bit 15
Bit 7
AM7
AM7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Reserved
—
—
—
(0x0)
byte0
byte4
MSB
For complete details on the MSCAN Rx buffer, see the MSCAN chapter
For complete details on the MSCAN Tx buffer, see the MSCAN chapter
AM6
AM6
Reserved
14
—
—
—
6
6
6
6
6
6
Backdoor comparison key bytes zero through three
Backdoor comparison key bytes four through seven
AM5
AM5
13
NVPROT
—
—
—
5
5
5
5
5
5
Table
byte1
byte5
(0x1)
4-4, are used for storing values used by
AM4
AM4
12
Reserved
—
—
—
4
4
4
4
4
4
FTRIM (bit 0)
AM3
AM3
Reserved
11
—
—
—
3
3
3
3
3
3
1
byte2
byte6
(0x2)
. Bandgap and MCG trim values
AM2
AM2
10
—
—
—
2
2
2
2
2
2
AM1
AM1
—
—
—
1
9
1
1
1
1
1
NVOPT
TRIM
byte3
byte7
(0x3)
LSB
Memory
Bit 0
AM0
AM0
Bit 8
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
—
—
—
4-11