MC68HC908MR8 Datasheet, PDF (38/372 Pages) Motorola, Inc – Microcontrollers

Memory Map
2.3 Unimplemented Memory Locations
Some addresses are unimplemented. Accessing an unimplemented
address will cause an illegal address reset. In the memory map and in
the input/output (I/O) register summary, unimplemented addresses are
shaded.
Some I/O bits are read-only; the write function is unimplemented. Writing
to a read-only I/O bit has no effect on MCU operation. In register figures,
the write function of read-only bits is shaded. Similarly, some I/O bits are
write-only; the read function is unimplemented. Reading of write-only I/O
bits has no effect on microcontroller unit (MCU) operation. In register
figures, the read function of write-only bits is shaded.
2.4 Reserved Memory Locations
Some addresses are reserved. Writing to a reserved address can have
unpredictable effects on MCU operation. In the memory map and in the
I/O register summary, reserved addresses are marked with the word
reserved.
Some I/O bits are reserved. Writing to a reserved bit can have
unpredictable effects on MCU operation. In register figures, reserved
bits are marked with the letter R.
Technical Data
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Memory Map
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor