MC9S08DE60 Datasheet, PDF (48/412 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 4 Memory
Table 4-4. MSCAN Foreground Receive and Transmit Buffer Layouts — Extended Mapping Shown
0x18B1 CANTIDR1
ID2
ID1
ID0
RTR
IDE
0x18B2 CANTIDR2
—
—
—
—
—
0x18B3 CANTIDR3
—
—
—
—
—
0x18B4 – CANTDSR0 –
0x18BB CANTDSR7
DB7
DB6
DB5
DB4
DB3
0x18BC CANTDLR
—
—
—
—
DLC3
0x18BD CANTTBPR
PRIO7 PRIO6 PRIO5 PRIO4 PRIO3
1 _{SRR and IDE are both 1s.}
2 _{The position of RTR differs between extended and standard identifier mapping.}
—
—
—
DB2
DLC2
PRIO2
—
—
—
DB1
DLC1
PRIO1
—
—
—
DB0
DLC0
PRIO0
Nonvolatile Flash registers, shown in Table 4-5, are located in the Flash memory. These registers include
an 8-byte backdoor key, NVBACKKEY, which can be used to gain access to secure memory resources.
The NVECC register controls whether error correction code is enabled after the next reset. During reset
events, the contents of NVPROT and NVOPT in the nonvolatile register area of the Flash memory are
transferred into corresponding FPROT and FOPT working registers in the high-page registers to control
security and block protection options.
Table 4-5. Nonvolatile Register Summary
Address Register Name
0xFFAE Reserved for
storage of FTRIM
0xFFAF Res. for storage of
MCGTRM
0xFFB0– NVBACKKEY
0xFFB7
0xFFB8 NVECC
0xFFB9 – Reserved
0xFFBC
0xFFBD NVPROT
0xFFBE Reserved
0xFFBF NVOPT
Bit 7
6
5
4
3
2
0
0
0
0
0
0
TRIM
8-Byte Comparison Key
ECC7
ECC6
ECC5
—
—
—
—
—
—
EPS
—
—
—
KEYEN FNORED EPGMOD
ECC4
—
—
—
0
ECC3
ECC2
—
—
—
—
FPS
—
—
0
0
1
Bit 0
0
FTRIM
ECC1
—
—
ECC0
—
—
—
—
SEC
Provided the key enable (KEYEN) bit is 1, the 8-byte comparison key can be used to temporarily
disengage memory security. This key mechanism can be accessed only through user code running in secure
memory. (A security key cannot be entered directly through background debug commands.) This security
key can be disabled completely by programming the KEYEN bit to 0. If the security key is disabled, the
only way to disengage security is by mass erasing the Flash if needed (normally through the background
debug interface) and verifying that Flash is blank. To avoid returning to secure mode after the next reset,
program the security bits (SEC) to the unsecured state (1:0).
MC9S08DE60 Series Data Sheet, Rev. 3
48
Freescale Semiconductor