HCS08 datasheet(36/198 Pages) NXP

36 / 198 page

Chapter 4 Memory Map and Register Definition

MC9S08QD4 Series MCU Data Sheet, Rev. 6

Freescale Semiconductor

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).

The ICS factory-trimmed value will be stored in 0xFFAE (bit-0) and 0xFFAF. Development tools, such as

programmers can trim the ICS and the internal temperature sensor (via the ADC) and store the values in

0xFFAD–0xFFAF.

4.4

RAM

The MC9S08QD4 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.

The RAM retains data when the MCU is in low-power wait, stop2, or stop3 mode. At power-on or after

wakeup from stop1, the contents of RAM are uninitialized. RAM data is unaffected by any reset provided

that the supply voltage does not drop below the minimum value for RAM retention (VRAM).

Table 4-4. Nonvolatile Register Summary

Address

Bit 7

654321

Bit 0

0xFFAA –

0xFFAC

Reserved

—

0xFFAD

Reserved for

ADCRL of AD26

value during ICS

trim

ADR7

ADR6

ADR5

ADR4

ADR3

ADR2

ADR1

ADR0

0xFFAE

Reserved for

ADCRH of AD26

value during ICS

trim and ICS Trim

value “FTRIM”

ADR9

ADR8

—

—FTRIM

0xFFAF

Reserved for

ICS Trim value

“TRIM”

TRIM

0xFFB0 –

0xFFB7

NVBACKKEY

8-Byte Comparison Key

0xFFB8 –

0xFFBC

Reserved

—

0xFFBD

NVPROT

FPS

FPDIS

0xFFBE

Unused

—

0xFFBF

NVOPT

KEYEN

FNORED

SEC01

SEC00

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