MC68HC908KX2 MOTOROLA [Motorola, Inc], MC68HC908KX2 Datasheet - Page 144
MC68HC908KX2
Manufacturer Part Number
MC68HC908KX2
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908KX2.pdf
(311 pages)
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Configuration Register (CONFIG)
9.3 Functional Description
Technical Data
144
NOTE:
Other Resets:
Address:
Address:
Reset:
Reset:
Read:
Write:
Read:
Write:
The configuration registers are used in the initialization of various
options and can be written once after each reset. All of the configuration
register bits are cleared during reset. Since the various options affect the
operation of the microcontroller unit (MCU), it is recommended that
these registers be written immediately after reset. The configuration
registers are located at $001E and $001F. For compatibility, a write to a
read-only memory (ROM) version of the MCU at this location will have
no effect. The configuration register may be read at anytime.
The CONFIG module is known as an MOR (mask option register) on a
ROM device. On a ROM device, the options are fixed at the time of
device fabrication and are neither writable nor changeable by the user.
On a FLASH device, the CONFIG registers are special registers
containing one-time writable latches after each reset. Upon a reset, the
CONFIG registers default to predetermined settings as shown in
Figure 9-1
COPRS
1. The LVI5OR3 bit is cleared only by a power-on reset (POR).
$001E
$001F
Bit 7
Bit 7
R
0
0
0
Figure 9-2. Configuration Register 1 (CONFIG1)
Figure 9-1. Configuration Register 2 (CONFIG2)
Configuration Register (CONFIG)
= Unimplemented
= Unimplemented
and
LVISTOP
6
0
0
6
0
0
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
Figure
LVIRSTD LVIPWRD LVI5OR3
XTALEN
EXT-
5
0
5
0
0
9-2.
U = Unaffected
SLOW
EXT-
R
4
0
4
0
0
= Reserved
CLKEN
EXT-
U
3
0
3
0
(1)
SSREC
2
0
0
2
0
0
OSCENIN-
STOP
STOP
1
0
1
0
0
MOTOROLA
SCIBD-
COPD
Bit 0
SRC
Bit 0
0
0
0
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