MC68HC908KX2 MOTOROLA [Motorola, Inc], MC68HC908KX2 Datasheet - Page 146

• Manufacturer Part Number: MC68HC908KX2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Configuration Register (CONFIG)
Technical Data
146
NOTE:
NOTE:
EXTXTALEN — External Crystal Enable Bit
This bit does not function without setting the EXTCLKEN bit also.
OSCENINSTOP — Oscillator Enable In Stop Mode Bit
This bit has the same functionality as the OSCSTOPENB CONFIG bit in
MC68HC908GP20 and MC68HC908GR8 parts.
EXTXTALEN enables the external oscillator circuits to be configured
for a crystal configuration where the PTB6/(OSC1) and PTB7/(OSC2)
pins are the connections for an external crystal.
Clearing the EXTXTALEN bit (default setting) allows the
PTB7/(OSC2) pin to function as a general-purpose I/O pin. Refer to
Table 9-1
Section 7. Internal Clock Generator Module (ICG)
detailed description of the external clock operation.
EXTXTALEN, when set, also configures the clock monitor to expect
an external clock source in the valid range of crystals (30 kHz to
100 kHz or 1 MHz to 8 MHz). When EXTXTALEN is clear, the clock
monitor will expect an external clock source in the valid range for
externally generated clocks when using the clock monitor (60 Hz to
32 MHz).
EXTXTALEN, when set, also configures the external clock
stabilization divider in the clock monitor for a 4096-cycle timeout to
allow the proper stabilization time for a crystal. When EXTXTALEN is
clear, the stabilization divider is configured to 16 cycles since an
external clock source does not need a startup time.
OSCENINSTOP, when set, will enable the internal clock generator
module to continue to generate clocks (either internal, ICLK, or
external, ECLK) in stop mode. See
Generator Module
running while the rest of the microcontroller stops. See
Timebase Module
and both ICLK and ECLK will be forced low during stop mode. The
default state for this option is clear, disabling the ICG in stop mode.
1 = Allows PTB7/(OSC2) to be an external crystal connection.
0 = PTB7/(OSC2) functions as an I/O port pin (default).
1 = Oscillator enabled to operate during stop mode
0 = Oscillator disabled during stop mode (default)
Configuration Register (CONFIG)
for configuration options for the external source. See
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
(TBM). When clear, all clock generation will cease
(ICG). This function is used to keep the timebase
Section 7. Internal Clock
for a more
Section 15.
MOTOROLA