Freescale Semiconductor, Inc.
Operating Modes and Resource Mapping
Background Debug Mode
the regular system vectors while BDM is active. While BDM is active, the
user memory from $FF00 to $FFFF is not in the map except through
serial BDM commands.
Bit 7
6
5
4
3
IVIS
1
2
1
0
0
0
0
0
0
0
0
Bit 0
SMODN
MODB
MODA
ESTR
EBSWAI
EME
RESET:
RESET:
RESET:
RESET:
RESET:
RESET:
RESET:
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
Special Single Chip
Special Exp Nar
Peripheral
1
1
1
Special Exp Wide
Normal Single Chip
Normal Exp Nar
Normal Exp Wide
$000B
0
0
0
MODE — Mode Register
MODE controls the MCU operating mode and various configuration
options. This register is not in the map in peripheral mode
SMODN, MODB, MODA — Mode Select Special, B and A
These bits show the current operating mode and reflect the status of
the BKGD, MODB and MODA input pins at the rising edge of reset.
SMODN is Read anytime. May only be written in special modes
(SMODN = 0). The first write is ignored;
MODB, MODA may be written once in Normal modes (SMODN = 1).
Write anytime in special modes (first write is ignored) – special
peripheral and reserved modes cannot be selected.
68HC(9)12D60 — Rev 4.0
MOTOROLA
Advance Information
Operating Modes and Resource Mapping
77
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MOTOROLA [ MOTOROLA ]
