MC68HC908AZ60 Datasheet, PDF (141/480 Pages) Motorola, Inc – HCMOS Microcontroller Unit

SIMOSCEN
Clock Generator Module (CGM)
I/O Signals
CGMXCLK
R_S^*
R_B
X₁
C₁
C₂
V_DD
C_F
C_BYP
*R_S can be 0 (shorted) when used with higher-frequency crystals. Refer to manufacturer’s data.
Figure 3. CGM External Connections
I/O Signals
The following paragraphs describe the CGM input/output (I/O) signals.
Crystal Amplifier
Input Pin (OSC1)
The OSC1 pin is an input to the crystal oscillator amplifier.
Crystal Amplifier
The OSC2 pin is the output of the crystal oscillator inverting amplifier.
Output Pin (OSC2)
External Filter
Capacitor Pin
(CGMXFC)
The CGMXFC pin is required by the loop filter to filter out phase
corrections. A small external capacitor is connected to this pin.
NOTE:
To prevent noise problems, C_F should be placed as close to the
CGMXFC pin as possible with minimum routing distances and no routing
of other signals across the C_F connection.
13-cgm
MOTOROLA
Clock Generator Module (CGM)
MC68HC908AZ60 — Rev 2.0
139