MC68HC912BD32CFU10 FREESCALE [Freescale Semiconductor, Inc], MC68HC912BD32CFU10 Datasheet - Page 47

• Manufacturer Part Number: MC68HC912BD32CFU10
• Description: Advance Information
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

1-mode
Contents
Introduction
Operating Modes
Operating Modes and Resource Mapping
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Operating Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Background Debug Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Internal Resource Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Memory Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Eight possible operating modes determine the operating configuration of
the MC68HC912BD32. 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. During reset an active pullup
is connected to the BKGD pin (as input) and active pulldowns are
connected to the MODB and MODA pins. If an open occurs on any of
these pins, the device will operate in normal single-chip mode.
Freescale Semiconductor, Inc.
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Operating Modes and Resource Mapping
Go to: www.freescale.com
Operating Modes and Resource Mapping
MC68HC912BD32 Rev 1.0