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C8051F502-IM 参数 Datasheet PDF下载

C8051F502-IM图片预览
型号: C8051F502-IM
PDF下载: 下载PDF文件 查看货源
内容描述: 混合信号ISP功能的Flash MCU系列 [Mixed Signal ISP Flash MCU Family]
分类和应用: 微控制器和处理器外围集成电路PC时钟
文件页数/大小: 312 页 / 2813 K
品牌: SILICON [ SILICON ]
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C8051F50x-F51x  
19.4. External Oscillator Drive Circuit  
The external oscillator circuit may drive an external crystal, ceramic resonator, capacitor, or RC network. A  
CMOS clock may also provide a clock input. For a crystal or ceramic resonator configuration, the crys-  
tal/resonator must be wired across the XTAL1 and XTAL2 pins as shown in Option 1 of Figure 19.1. A  
10 Mresistor also must be wired across the XTAL2 and XTAL1 pins for the crystal/resonator configura-  
tion. In RC, capacitor, or CMOS clock configuration, the clock source should be wired to the XTAL2 pin as  
shown in Option 2, 3, or 4 of Figure 19.1. The type of external oscillator must be selected in the OSCXCN  
register, and the frequency control bits (XFCN) must be selected appropriately (see SFR Definition 19.6).  
Important Note on External Oscillator Usage: Port pins must be configured when using the external  
oscillator circuit. When the external oscillator drive circuit is enabled in crystal/resonator mode, Port pins  
P0.2 and P0.3 are used as XTAL1 and XTAL2 respectively. When the external oscillator drive circuit is  
enabled in capacitor, RC, or CMOS clock mode, Port pin P0.3 is used as XTAL2. The Port I/O Crossbar  
should be configured to skip the Port pins used by the oscillator circuit; see Section “20.3. Priority Crossbar  
Decoder” on page 180 for Crossbar configuration. Additionally, when using the external oscillator circuit in  
crystal/resonator, capacitor, or RC mode, the associated Port pins should be configured as analog inputs.  
In CMOS clock mode, the associated pin should be configured as a digital input. See Section “20.4. Port  
I/O Initialization” on page 182 for details on Port input mode selection.  
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Rev. 1.1