MC68HC908AT32 Datasheet, PDF (35/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 2
Memory Map
2.1 Introduction
The CPU08 can address 64 Kbytes of memory space. The memory map, shown in Figure 2-1, includes:
• 32 Kbytes of FLASH on-chip electrically erasable programmable read-only memory (EEPROM) for
the MC68HC08AZ32 emulator (64-pin QFP) or the MC68HC08AS20 emulator (52-pin PLCC) with
memory extentsion
• 20 Kbytes of FLASH EEPROM for the MC68HC08AS20 emulator (52-pin PLCC)
• 1024 bytes of random-access memory (RAM) for the MC68HC08AZ32 emulator (64-pin QFP) or
the MC68HC08AS20 emulator (52-pin PLCC) with memory extentsion
• 640 bytes of RAM for the MC68HC08AS20 emulator (52-pin PLCC)
• 512 bytes of EEPROM with security option
• 48 bytes of user-defined vectors for the MC68HC08AZ32 emulator (64-pin QFP)
• 36 bytes of user-defined vectors for the MC68HC08AS20 emulator (52-pin PLCC)
• 224 bytes of monitor read-only memory (ROM)
• 128 bytes of CAN control and message buffers
NOTE
The memory extension bit in the CONFIG-2 register must be set to enable
1 K of RAM memory space and 32 K of FLASH memory space in the
MC68HC08AS20 emulator configuration. (See Chapter 10 Configuration
Register (CONFIG-2).)
The following definitions apply to the memory map (Figure 2-1) representation of reserved and
unimplemented locations.
• Reserved — Accessing a reserved location can have unpredictable effects on MCU operation.
• Unimplemented — Accessing an unimplemented location causes an illegal address reset if illegal
address resets are enabled.
MC68HC908AT32 Data Sheet, Rev. 3.1
Freescale Semiconductor
35