Datasheet

Operating Modes
MC9S12DP256 — Revision 1.1
Operating Modes
.
The MODE register is used to establish the operating mode and other
miscellaneous functions (i.e. internal visibility, clocks stop in wait mode
and emulation of Port E and K.
In peripheral modes this register is not accessible but it is reset as shown
to configure system features. Changes to bits in the MODE register are
delayed one cycle after the write.
This register is not in the on-chip map in emulation and peripheral
modes.
The MODE register controls the MCU operating mode and various
configuration options.
MODC, MODB, MODA — Mode Select bits
These bits indicate the current operating mode.
If MODA=1, then MODC, MODB, MODA are write never.
If MODC=MODA=0, then MODC, MODB, MODA are write anytime
except that you cannot change to or from peripheral mode.
If MODC=1, MODB=0 and MODA=0, then MODC is write never,
MODB, MODA are write once, except that you cannot change to
peripheral, special test, special single chip or emulation modes.
MODE — Mode Register $000B
Bit 7 654321Bit 0
Read
MODC MODB MODA 0 IVIS 0 EMK EME
RESET: 00000000Special Single Chip
RESET: 00101011Emulation Exp Nar
RESET: 01001000
Special Tes
t
RESET: 01101011Emulation Exp Wide
RESET: 10000000Normal Single Chip
RESET: 10100000Normal Exp Narrow
RESET: 11000000 Peripheral
RESET: 11100000Normal Exp Wide
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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