MC9S08DZ60_08 Datasheet, PDF (51/416 Pages) Freescale Semiconductor, Inc – 8-Bit HCS08 Central Processor Unit (CPU)

Chapter 4 Memory
Table 4-4. MSCAN Foreground Receive and Transmit Buffer Layouts — Extended Mapping Shown
0x18AF CANRTSRL
TSR7
TSR6
TSR5
TSR4
TSR3
0x18B0 CANTIDR0
ID10
ID9
ID8
ID7
ID6
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.}
TSR2
ID5
—
—
—
DB2
DLC2
PRIO2
TSR1
ID4
—
—
—
DB1
DLC1
PRIO1
TSR0
ID3
—
—
—
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.
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 Bit 7
6
5
4
3
2
0xFFAE Reserved for
storage of FTRIM
0
0
0
0
0
0
0xFFAF Res. for storage of
MCGTRM
TRIM
0xFFB0– NVBACKKEY
0xFFB7
8-Byte Comparison Key
0xFFB8– Reserved
0xFFBC
—
—
—
—
—
—
—
—
—
—
—
—
0xFFBD NVPROT
EPS
FPS
0xFFBE Reserved
—
—
—
—
—
—
0xFFBF NVOPT
KEYEN FNORED EPGMOD
0
0
0
1
Bit 0
0
FTRIM
—
—
—
—
—
—
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).
MC9S08DZ60 Series Data Sheet, Rev. 4
Freescale Semiconductor
51