Datasheet

Chapter 4 Memory
MC9S08AC16 Series Data Sheet, Rev. 9
48 Freescale Semiconductor
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.
0x1843 Reserved
— — — — — — — —
0x1844 PTBPE
R R R R PTBPE3 PTBPE2 PTBPE1 PTBPE0
0x1845 PTBSE
R R R R PTBSE3 PTBSE2 PTBSE1 PTBSE0
0x1846 PTBDS
R R R R PTBDS3 PTBDS2 PTBDS1 PTBDS0
0x1847 Reserved
— — — — — — — —
0x1848 PTCPE
0 R PTCPE5 PTCPE4 PTCPE3 PTCPE2 PTCPE1 PTCPE0
0x1849 PTCSE
0 R PTCSE5 PTCSE4 PTCSE3 PTCSE2 PTCSE1 PTCSE0
0x184A PTCDS
0 R PTCDS5 PTCDS4 PTCDS3 PTCDS2 PTCDS1 PTCDS0
0x184B Reserved
— — — — — — — —
0x184C PTDPE
R R R R PTDPE3 PTDPE2 PTDPE1 PTDPE0
0x184D PTDSE
R R R R PTDSE3 PTDSE2 PTDSE1 PTDSE0
0x184E PTDDS
R R R R PTDDS3 PTDDS2 PTDDS1 PTDDS0
0x184F Reserved
— — — — — — — —
0x1850 PTEPE
PTEPE7 PTEPE6 PTEPE5 PTEPE4 PTEPE3 PTEPE2 PTEPE1 PTEPE0
0x1851 PTESE
PTESE7 PTESE6 PTESE5 PTESE4 PTESE3 PTESE2 PTESE1 PTESE0
0x1852 PTEDS
PTEDS7 PTEDS6 PTEDS5 PTEDS4 PTEDS3 PTEDS2 PTEDS1 PTEDS0
0x1853 Reserved
— — — — — — — —
0x1854 PTFPE
R PTFPE6 PTFPE5 PTFPE4 R R PTFPE1 PTFPE0
0x1855 PTFSE
R PTFSE6 PTFSE5 PTFSE4 R R PTFSE1 PTFSE0
0x1856 PTFDS
R PTFDS6 PTFDS5 PTFDS4 R R PTFDS1 PTFDS0
0x1857 Reserved
— — — — — — — —
0x1858 PTGPE
0 PTGPE6 PTGPE5 PTGPE4 PTGPE3 PTGPE2 PTGPE1 PTGPE0
0x1859 PTGSE
0 PTGSE6 PTGSE5 PTGSE4 PTGSE3 PTGSE2 PTGSE1 PTGSE0
0x185A PTGDS
0 PTGDS6 PTGDS5 PTGDS4 PTGDS3 PTGDS2 PTGDS1 PTGDS0
0x185B–
0x185F
Reserved
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—
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—
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1
This reserved bit must always be written to 0.
Table 4-3. High-Page Register Summary (Sheet 3 of 3)
AddressRegister NameBit 7654321Bit 0