MC908AP8CFBE Datasheet, PDF (29/324 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 2
Memory
2.1 Introduction
The CPU08 can address 64k-bytes of memory space. The memory map, shown in Figure 2-1, includes:
• 62,368 bytes of user FLASH — MC68HC908AP64
32,768 bytes of user FLASH — MC68HC908AP32
16,384 bytes of user FLASH — MC68HC908AP16
8,192 bytes of user FLASH — MC68HC908AP8
• 2,048 bytes of RAM — MC68HC908AP64 and MC68HC908AP32
1,024 bytes of RAM — MC68HC908AP16 and MC68HC908AP8
• 48 bytes of user-defined vectors
• 959 bytes of monitor ROM
2.2 Input/Output (I/O) Section
Most of the control, status, and data registers are in the zero page area of $0000–$005F. Additional I/O
registers have these addresses:
• $FE00; SIM break status register, SBSR
• $FE01; SIM reset status register, SRSR
• $FE02; Reserved
• $FE03; SIM break flag control register, SBFCR
• $FE04; interrupt status register 1, INT1
• $FE05; interrupt status register 2, INT2
• $FE06; interrupt status register 3, INT3
• $FE07; Reserved
• $FE08; FLASH control register, FLCR
• $FE09; FLASH block protect register, FLBPR
• $FE0A; Reserved
• $FE0B; Reserved
• $FE0C; Break address register high, BRKH
• $FE0D; Break address register low, BRKL
• $FE0E; Break status and control register, BRKSCR
• $FE0F; LVI Status register, LVISR
• $FFCF; Mask option register, MOR (FLASH register)
• $FFFF; COP control register, COPCTL
2.3 Monitor ROM
The 959 bytes at addresses $FC00–$FDFF and $FE10–$FFCE are reserved ROM addresses that
contain the instructions for the monitor functions. (See Chapter 8 Monitor ROM (MON).)
MC68HC908AP Family Data Sheet, Rev. 4
Freescale Semiconductor
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