Datasheet

Oscillator Module (OSC)
Oscillator Module Signals
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
MOTOROLA Oscillator Module (OSC) 107
NON-DISCLOSURE AGREEMENT REQUIRED
Figure 8-2. RC Oscillator External Connections
8.5 Oscillator Module Signals
The following paragraphs describe the signals that are inputs to and
outputs from the oscillator module.
8.5.1 Crystal Amplifier Input Pin (OSC1)
The OSC1 pin is either an input to the crystal oscillator amplifier, an input
to the RC oscillator circuit, or an external clock source.
For the internal oscillator configuration, the OSC1 pin can assume other
functions according to Table 1-3. Function Priority in Shared Pins.
MCU
R
EXT
SIMOSCEN
OSC1
EXTERNAL RC
OSCILLATOR
EN
RCCLK
÷ 2
BUSCLKX2BUSCLKX4
TO SIMFROM SIM
V
DD
PTA4
I/O
1
0
PTA4
OSC2EN
PTA4/BUSCLKX4 (OSC2)
TO SIM
See Section 18. Electrical Specifications
for component value requirements.
0
1
INTCLK
OSCRCOPT