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MC68HC908GT16_07 Datasheet, PDF (29/292 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Chapter 2
Memory
2.1 Introduction
The CPU08 can address 64 Kbytes of memory space. The memory map, shown in Figure 2-1, includes:
⢠User Flash memory:
â MC68HC908GT16 â 15,872 bytes
â MC68HC908GT8 â 7,680 bytes
⢠512 bytes of random-access memory (RAM)
⢠720 bytes of Flash programming routines read-only memory (ROM)
⢠36 bytes of user-defined vectors
⢠304 bytes of monitor ROM
2.2 Unimplemented Memory Locations
Accessing an unimplemented location can cause an illegal address reset. In the memory map (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 the Figure 2-1 and
in register figures in this document, reserved locations are marked with the word Reserved or with the
letter R.
2.4 Input/Output (I/O) Section
Most of the control, status, and data registers are in the zero page area of $0000â$003F. Additional I/O
registers have these addresses:
⢠$FE00; SIM break status register, SBSR
⢠$FE01; SIM reset status register, SRSR
⢠$FE02; reserved, SUBAR
⢠$FE03; SIM break flag control register, SBFCR
⢠$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
⢠$FE09; break address register high, BRKH
⢠$FE0A; break address register low, BRKL
⢠$FE0B; break status and control register, BRKSCR
MC68HC908GT16 ⢠MC68HC908GT8 ⢠MC68HC08GT16 Data Sheet, Rev. 5.0
Freescale Semiconductor
29
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