M68HC08 datasheet(36/288 Pages) FREESCALE

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Memory Map

Data Sheet

MC68HC908BD48 — Rev. 2.1

Memory Map

Freescale Semiconductor

2.4 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.

2.5 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; reserved

•

$FE07; FLASH Control Register, FLCR

•

$FE08; FLASH block protect register, FLBPR

•

$FE09; reserved

•

$FE0A; reserved

•

$FE0B; reserved

•

$FE0C; Break Address Register High, BRKH

•

$FE0D; Break Address Register Low, BRKL

•

$FE0E; Break Status and Control Register, BRKSCR

Data registers are shown in Figure 2-2. Table 2-1 is a list of vector

locations.

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