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4571 Scheda tecnica(PDF) 49 Page - Renesas Technology Corp |
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4571 Scheda tecnica(HTML) 49 Page - Renesas Technology Corp |
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49 / 126 page  Rev.1.02 May 25, 2007 Page 49 of 124 REJ03B0179-0102 4571 Group CLOCK CONTROL The clock control circuit consists of the following circuits. • Ceramic oscillation circuit • Frequency divider • Internal clock generating circuit The system clock and the instruction clock are generated as the source clock for operation by these circuits. Figure 50 shows the structure of the clock control circuit. Fig 50. Clock control circuit structure XIN 00 01 10 11 MR3, MR2 Division circuit divided by 8 divided by 4 divided by 2 Internal clock generation circuit (divided by 3) System clock (STCK) Instruction clock (INSTCK) Ceramic oscillation circuit Voltage drop detection circuit (reset occurs) S R Q EPOF instruction + POF instruction Key-on wakeup signal RESET Oscillation stop signal |
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