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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ELANSC310 데이터시트(PDF) 42 Page - Advanced Micro Devices |
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ELANSC310 데이터시트(HTML) 42 Page - Advanced Micro Devices |
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42 / 119 page  42 Élan™SC310 Microcontroller Data Sheet PREL IMINARY management control (PMC) pins that are controlled by the operating modes. Clock Generation The ÉlanSC310 microcontroller requires only one 32.768-kHz clock input that is used to generate all other clock frequencies required by the system. This 32.768-kHz clock input is provided through the X32IN and X32OUT pins and the crystal oscillator circuit. This input frequency is then used to internally drive multiple Phase-Locked Loops that create all necessary fre- quencies. The clock rate that is used to drive the internal CPU is determined by the mode of operation of the ÉlanSC310 microcontroller. The clock generation, control, and distribution scheme are detailed in Figure 1 and Figure 2, which follow. INT_PLL LS_PLL HS_PLL VID_PLL EN 32 kHz Input LS_PLL_EN HS_PLL_EN VID_PLL_EN 1.4746 MHz 18.432 MHz 1.8432 MHz 1.1892 MHz 14.336 MHz EN EN EN Programmable 2 x CPU Clock Figure 1. PLL Block Diagram ÷ 2 36.864 MHz 2.048 MHz |
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