MC68HLC908QY4 Datasheet, PDF (23/182 Pages) Motorola, Inc – Microcontrollers

Chapter 2
Memory
2.1 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 MC68HLC908QT4 and MC68HLC908QY4
• 1536 bytes of user FLASH for MC68HLC908QT2, MC68HLC908QT1, MC68HLC908QY2, and
MC68HLC908QY1
• 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
2.2 Unimplemented Memory Locations
Accessing an unimplemented location can have unpredictable effects on MCU operation. In Figure 2-1
and in register figures in this document, unimplemented locations are shaded.
2.3 Reserved Memory Locations
Accessing a reserved location can have unpredictable effects on MCU operation. In Figure 2-1 and in
register figures in this document, reserved locations are marked with the word Reserved or with the
letter R.
MC68HLC908QY/QT Family Data Sheet, Rev. 3
Freescale Semiconductor
23