Datasheet

MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
MOTOROLA Memory 33
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Data Sheet — MC68HC908QY4
Section 2. Memory
2.1 Contents
2.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
2.3 Unimplemented Memory Locations . . . . . . . . . . . . . . . . . . . . .33
2.4 Reserved Memory Locations . . . . . . . . . . . . . . . . . . . . . . . . . .35
2.5 Input/Output (I/O) Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
2.2 Introduction
The central processor unit (CPU08) can address 64 Kbytes of memory
space. The memory map, shown in Figure 2-1, includes:
• 4096 bytes of user FLASH for MC68HC908QT4 and
MC68HC908QY4
• 1536 bytes of user FLASH for MC68HC908QT2,
MC68HC908QT1, MC68HC908QY2, and MC68HC908QY1
• 128 bytes of random access memory (RAM)
• 48 bytes of user-defined vectors, located in FLASH
• 416 bytes of monitor read-only memory (ROM)
• 1536 bytes of FLASH program and erase routines, located in
ROM
2.3 Unimplemented Memory Locations
Accessing a reserved location can have unpredictable effects on MCU
operation. In Figure 2-1 and in register figures in this document,
unimplemented locations are shaded.