Datasheet

Chapter 4 Memory Map and Register Definition

MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 5

44 Freescale Semiconductor

Nonvolatile FLASH registers, shown in Table 4-4, are located in the FLASH memory. These registers

include an 8-byte backdoor key that 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.

0x1816 DBGC DBGEN ARM TAG BRKEN RWA RWAEN RWB RWBEN

0x1817 DBGT TRGSEL BEGIN

0 0 TRG3 TRG2 TRG1 TRG0

0x1818 DBGS AF BF ARMF

0 CNT3 CNT2 CNT1 CNT0

0x1819–

0x181F

Reserved

—

0x1820 FCDIV DIVLD PRDIV8 DIV

0x1821 FOPT KEYEN FNORED

0 0 0 0 SEC01 SEC00

0x1822 Reserved

— — — — — — — —

0x1823 FCNFG

0 0 KEYACC 0 0 0 0 0

0x1824 FPROT FPS FPDIS

0x1825 FSTAT FCBEF FCCF FPVIOL FACCERR

0 FBLANK 0 0

0x1826 FCMD FCMD

0x1827–

0x183F

Reserved

—

0x1840 PTAPE

0 0 PTAPE5 PTAPE4 PTAPE3 PTAPE2 PTAPE1 PTAPE0

0x1841 PTASE

0 0 PTASE5 PTASE4 PTASE3 PTASE2 PTASE1 PTASE0

0x1842 PTADS

0 0 PTADS5 PTADS4 PTADS3 PTADS2 PTADS1 PTADS0

0x1843 Reserved

— — — — — — — —

0x1844 PTBPE PTBPE7 PTBPE6 PTBPE5 PTBPE4 PTBPE3 PTBPE2 PTBPE1 PTBPE0

0x1845 PTBSE PTBSE7 PTBSE6 PTBSE5 PTBSE4 PTBSE3 PTBSE2 PTBSE1 PTBSE0

0x1846 PTBDS PTBDS7 PTBDS6 PTBDS5 PTBDS4 PTBDS3 PTBDS2 PTBDS1 PTBDS0

0x1847 Reserved

— — — — — — — —

Table 4-3. High-Page Register Summary (continued)

AddressRegister NameBit 7654321Bit 0