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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HCS08 데이터시트(PDF) 22 Page - Motorola, Inc |
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HCS08 데이터시트(HTML) 22 Page - Motorola, Inc |
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22 / 290 page  Introduction MC9S08GB/GT 22 MOTOROLA Some of the modules inside the MCU have clock source choices. Figure 1-3 shows a simplified clock connection diagram. The ICG supplies the clock sources: • ICGOUT is an output of the ICG module. It is either: – The external crystal oscillator – An external clock source – The output of the digitally-controlled oscillator (DCO) in the frequency-locked loop sub-module Control bits inside the ICG determine which source is connected. • FFE is a control signal generated inside the ICG. If the frequency of ICGOUT > 4 × the frequency of ICGERCLK, this signal is a logic 1 and the fixed-frequency clock will be the ICGERCLK. Otherwise the fixed-frequency clock will be BUSCLK. • ICGLCLK — Development tools can select this internal self-clocked source (~ 8 MHz) to speed up BDC communications in systems where the bus clock is slow. • ICGERCLK — External reference clock can be selected as the real-time interrupt clock source. |
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