Chapter 2
Memory
2.1 Introduction
The central processor unit (CPU08) can address 64 Kbytes of memory space. The memory map is shown
in
2.2 Unimplemented Memory Locations
Executing code from an unimplemented location will cause an illegal address reset. In
unimplemented locations are shaded.
2.3 Reserved Memory Locations
Accessing a reserved location can have unpredictable effects on MCU operation. In
reserved
locations are marked with the word reserved or with the letter R.
2.4 Direct Page Registers
shows the memory mapped registers. Registers with addresses between $0000 and $00FF
are considered direct page registers and all instructions including those with direct page addressing
modes can access them. Registers between $0100 and $FFFF require non-direct page addressing
modes. See
for more information on addressing modes.
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 5
Freescale Semiconductor
25
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
