MC9S08LC60 Datasheet, PDF (47/358 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 4 Memory
Table 4-3. High-Page Register Summary (continued)
Address Register Name Bit 7
6
0x185D–
0x1861
0x1862
0x1863
0x1864
0x1865
0x1866–
0x186F
Reserved
LCDCLKS
LCDSUPPLY
LCDBCTL
LCDCMD
Reserved
—
—
SOURCE
LCDCPEN
BLINK
LCDIF
DIV16
LCDCPMS
0
0
—
—
5
—
CLKADJ5
CPCADJ1
0
0
—
4
—
CLKADJ4
CPCADJ0
0
0
—
3
2
1
Bit 0
—
—
—
—
CLKADJ3
HDRVBUF
BLKMODE
LCDDRMS
CLKADJ2
BBYPASS
BRATE2
0
CLKADJ1 CLKADJ0
VSUPPLY1 VSUPPLY0
BRATE1 BRATE0
LCDCLR BLANK
—
—
—
—
Nonvolatile FLASH registers, shown in Table 4-4, are located in the FLASH memory. These registers
include an 8-byte backdoor key which optionally 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 4-4. Nonvolatile Register Summary
Address
Register
Name
Bit 7
6
5
4
3
2
1
Bit 0
0xFFB0– NVBACKKEY
0xFFB7
8-Byte Comparison Key
0xFFB8– Reserved
0xFFBC
—
—
—
—
—
—
—
—
0xFFBD
0xFFBE
NVPROT
NVICGTRM¹
FPS7
FPS6
FPS5
FPS4
FPS3
NVTRIM
FPS2
FPS1
FPDIS
0xFFBF NVOPT
KEYEN FNORED
0
0
0
0
SEC01 SEC00
1 _{Freescale Semiconductor provides a factory trim to set the FIRG to 243 kHz. If user code changes the value of the NVICGTRM}
register, the factory trim value will be lost. User code should save the content of NVICGTRM before any mass erase operation.
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 (SEC01:SEC00) to the unsecured state (1:0).
4.3 RAM
The MC9S08LC60 Series includes static RAM. The locations in RAM below 0x0100 can be accessed
using the more efficient direct addressing mode, and any single bit in this area can be accessed with the bit
manipulation instructions (BCLR, BSET, BRCLR, and BRSET). Locating the most frequently accessed
program variables in this area of RAM is preferred.
MC9S08LC60 Series Advance Information Data Sheet, Rev. 2
Freescale Semiconductor
PRELIMINARY
47