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| 型号： | MC68HC08GP8ACFB |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | PLASTIC, QFP-44 |
| 文件页数： | 80/126页 |
| 文件大小： | 4243K |
| 代理商： | MC68HC08GP8ACFB |
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Clock Generator Module (CGM)
I/O Signals
MC68HC08GP8A
Data Sheet
MOTOROLA
Clock Generator Module (CGM)
57
4.4 I/O Signals
The following paragraphs describe the CGM I/O signals.
4.4.1 Crystal Amplifier Input Pin (OSC1)
The OSC1 pin is an input to the crystal oscillator amplifier.
4.4.2 Crystal Amplifier Output Pin (OSC2)
The OSC2 pin is the output of the crystal oscillator inverting amplifier.
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.
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