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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MC68HC908GR4MP 데이터시트(PDF) 77 Page - Freescale Semiconductor, Inc |
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MC68HC908GR4MP 데이터시트(HTML) 77 Page - Freescale Semiconductor, Inc |
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77 / 286 page  I/O Signals MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7 Freescale Semiconductor 77 Figure 7-2. CGMC External Connections 7.4 I/O Signals The following paragraphs describe the CGMC I/O signals. 7.4.1 Crystal Amplifier Input Pin (OSC1) The OSC1 pin is an input to the crystal oscillator amplifier. 7.4.2 Crystal Amplifier Output Pin (OSC2) The OSC2 pin is the output of the crystal oscillator inverting amplifier. 7.4.3 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 7-2.) 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. OSC1 C1 C2 SIMOSCEN CGMXCLK RB X1 RS CBYP OSC2 CGMXFC VDDA Note: Filter network in box can be replaced with a 0.47 μF capacitor, but will degrade stability. VDD OSCSTOPENB (FROM CONFIG) RF1 CF2 CF1 VSSA 0.1 μF |
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