MC68HC08AZ0 Datasheet, PDF (120/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Clock Generator Module (CGM)
SIMOSCEN
OSC1
R_B
X₁
C₁
CGMXCLK
OSC1
R_S^*
V_SSA
C₂
CGMXFC
C_F
V_DDA
V_DD
C_BYP
*R_S can be zero (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 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.
MC68HC08AZ0
12-cgm
118
Clock Generator Module (CGM)
MOTOROLA
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