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4508 Datasheet(PDF) 56 Page - Renesas Technology Corp |
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4508 Datasheet(HTML) 56 Page - Renesas Technology Corp |
56 / 142 page Rev.1.02 2006.12.22 page 56 of 140 REJ03B0148-0102 4508 Group CLOCK CONTROL The clock control circuit consists of the following circuits. • On-chip oscillator (internal oscillator) • Ceramic oscillation circuit • RC oscillation circuit • Multi-plexer (clock selection circuit) • Frequency divider • Internal clock generating circuit Fig. 49 Clock control circuit structure The system clock and the instruction clock are generated as the source clock for operation by these circuits. Figure 49 shows the structure of the clock control circuit. The 4508 Group operates by the on-chip oscillator clock (f(RING)) which is the internal oscillator after system is released from reset. Also, the ceramic resonator or the RC oscillation can be used for the source oscillation (f(XIN)) of the 4508 Group. MR3, MR2 00 01 10 11 QS R CRCK instruction QS R XOUT XIN Key-on wakeup signal Instruction clock (INSTCK) RC oscillation circuit Division circuit Internal clock generation circuit (divided by 3) System clock On-chip oscillator Multiplexer Ceramic resonator circuit EPOF instruction + POF instruction MR1 Q RG0 Internal reset signal MR0 0 1 f(RING) f(XIN) divided by 2 divided by 4 divided by 8 |
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