mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 75

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Technical Data — MC68HC912DG128
5.1 Contents
5.2 Introduction
5.3 Operating Modes
MC68HC912DG128 — Rev 3.0
MOTOROLA
5.2
5.3
5.4
5.5
5.6
Eight possible operating modes determine the operating configuration of
the MC68HC912DG128. Each mode has an associated default memory
map and external bus configuration. After reset, most system resources
can be mapped to other addresses by writing to the appropriate control
registers.
The operating mode out of reset is determined by the states of the
BKGD, MODB, and MODA pins during reset.
The SMODN, MODB, and MODA bits in the MODE register show current
operating mode and provide limited mode switching during operation.
The states of the BKGD, MODB, and MODA pins are latched into these
bits on the rising edge of the reset signal.
In expanded modes, all address space not used by internal resources is
by default external memory.
Freescale Semiconductor, Inc.
For More Information On This Product,
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Background Debug Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Internal Resource Mapping. . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Memory Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
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Operating Modes
Section 5. Operating Modes
Technical Data
75