Datasheet

MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
110 Oscillator Module (OSC) MOTOROLA
Oscillator Module (OSC)
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8.6.1 Wait Mode
The WAIT instruction has no effect on the oscillator logic. BUSCLKX2
and BUSCLKX4 continue to drive to the SIM module.
8.6.2 Stop Mode
The STOP instruction disables either the XTALCLK, the RCCLK, or
INTCLK output, hence BUSCLKX2 and BUSCLKX4.
8.7 Oscillator During Break Mode
The oscillator continues to drive BUSCLKX2 and BUSCLKX4 when the
device enters the break state.
8.8 CONFIG2 Options
Two CONFIG2 register options affect the operation of the oscillator
module: OSCOPT1 and OSCOPT0. All CONFIG2 register bits will have
a default configuration. Refer to Section 5. Configuration Register
(CONFIG) for more information on how the CONFIG2 register is used.
Table 8-2 shows how the OSCOPT bits are used to select the oscillator
clock source.
Table 8-2. Oscillator Modes
OSCOPT1 OSCOPT0 Oscillator Modes
0 0 Internal Oscillator
0 1 External Oscillator
1 0 External RC
1 1 External Crystal