s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 92

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Clock Generator Module (CGM)
CGMXCLK can be used by other modules which require precise timing for operation. The duty cycle of
CGMXCLK is not guaranteed to be 50% and depends on external factors, including the crystal and related
external components.
An externally generated clock also can feed the OSC1 pin of the crystal oscillator circuit. Connect the
external clock to the OSC1 pin and let the OSC2 pin float.
92
OSC1
CGMRDV
DETECTOR
DETECTOR
CGMVDV
PHASE
LOCK
LOCK
V
DDA
CGMRCLK
CGMXFC
AUTO
FREQUENCY
BANDWIDTH
MUL7–MUL4
CONTROL
Figure 8-1. CGM Block Diagram
DIVIDER
MC68HC908AZ32A Data Sheet, Rev. 2
FILTER
LOOP
ACQ
PLL ANALOG
V
SS
CIRCUIT
SELECT
CLOCK
PLLIE
BCS
CONTROLLED
OSCILLATOR
VRS7–VRS4
INTERRUPT
CONTROL
CGMVCLK
VOLTAGE
PLLF
÷
2
A
B S*
CGMINT
*When S = 1,
CGMOUT = B
Freescale Semiconductor
CGMXCLK
CGMOUT
USER MODE
MONITOR MODE
PTC3