MC908JL3ECPE Datasheet, PDF (21/180 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 2
Memory
2.1 Introduction
The CPU08 can address 64 Kbytes of memory space. The memory map, shown in Figure 2-1, includes:
• 4,096 bytes of user Flash — MC68H(R)C908JL3E/JK3E
1,536 bytes of user Flash — MC68H(R)C908JK1E
• 128 bytes of RAM
• 48 bytes of user-defined vectors
• 960 bytes of Monitor ROM
2.2 I/O Section
Addresses $0000–$003F, shown in Figure 2-2, contain most of the control, status, and data registers.
Additional I/O registers have the following addresses:
• $FE00; Break Status Register, BSR
• $FE01; Reset Status Register, RSR
• $FE03; Break Flag Control Register, BFCR
• $FE04; Interrupt Status Register 1, INT1
• $FE05; Interrupt Status Register 2, INT2
• $FE06; Interrupt Status Register 3, INT3
• $FE08; Flash Control Register, FLCR
• $FE09; Flash Block Protect Register, FLBPR
• $FE0C; Break Address Register High, BRKH
• $FE0D; Break Address Register Low, BRKL
• $FE0E; Break Status and Control Register, BRKSCR
• $FFFF; COP Control Register, COPCTL
2.3 Monitor ROM
The 960 bytes at addresses $FC00–$FDFF and $FE10–$FFCF are reserved ROM addresses that
contain the instructions for the monitor functions. (See Chapter 7 Monitor ROM (MON).)
MC68HC908JL3E Family Data Sheet, Rev. 4
Freescale Semiconductor
21