MC68HC08GZ32 Datasheet, PDF(61/320 Page) Freescale Semiconductor, Inc – Microcontrollers

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MC68HC08GZ32 Datasheet, PDF (61/320 Pages) Freescale Semiconductor, Inc – Microcontrollers

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4.4.2 Crystal Amplifier Output Pin (OSC2)

The OSC2 pin is the output of the crystal oscillator inverting amplifier.

I/O Signals

4.4.3 External Filter Capacitor Pin (CGMXFC)

The CGMXFC pin is required by the loop filter to filter out phase corrections. An external filter network is

connected to this pin. (See Figure 4-2.)

NOTE

To prevent noise problems, the filter network should be placed as close to

the CGMXFC pin as possible, with minimum routing distances and no

routing of other signals across the network.

4.4.4 PLL Analog Power Pin (VDDA)

VDDA is a power pin used by the analog portions of the PLL. Connect the VDDA pin to the same voltage

potential as the VDD pin.

NOTE

Route VDDA carefully for maximum noise immunity and place bypass

capacitors as close as possible to the package.

4.4.5 PLL Analog Ground Pin (VSSA)

VSSA is a ground pin used by the analog portions of the PLL. Connect the VSSA pin to the same voltage

potential as the VSS pin.

NOTE

Route VSSA carefully for maximum noise immunity and place bypass

capacitors as close as possible to the package.

4.4.6 Oscillator Enable Signal (SIMOSCEN)

The SIMOSCEN signal comes from the system integration module (SIM) and enables the oscillator and

PLL.

4.4.7 Oscillator Stop Mode Enable Bit (OSCSTOPENB)

OSCSTOPENB is a bit in the MOR2 register that enables the oscillator to continue operating during stop

mode. If this bit is set, the oscillator continues running during stop mode. If this bit is not set (default), the

oscillator is controlled by the SIMOSCEN signal which will disable the oscillator during stop mode.

4.4.8 Crystal Output Frequency Signal (CGMXCLK)

CGMXCLK is the crystal oscillator output signal. It runs at the full speed of the crystal (fXCLK) and comes

directly from the crystal oscillator circuit. Figure 4-2 shows only the logical relation of CGMXCLK to OSC1

and OSC2 and may not represent the actual circuitry. The duty cycle of CGMXCLK is unknown and may

depend on the crystal and other external factors. Also, the frequency and amplitude of CGMXCLK can be

unstable at start up.

MC68HC08GZ32 Data Sheet, Rev. 3

Freescale Semiconductor

61

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