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HD404324FS Datasheet(PDF) 32 Page - Renesas Technology Corp |
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HD404324FS Datasheet(HTML) 32 Page - Renesas Technology Corp |
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32 / 103 page  HD404054 Series/HD404094 Series 30 Internal Oscillator Circuit A block diagram of the clock generation circuit is shown in figure 17. As shown in table 18, a ceramic oscillator can be connected to OSC 1 and OSC2. The system oscillator can also be operated by an external clock. After RESET input or after stop mode has been cancelled, the division ratio of the system clock can be selected as 1/4 or 1/32 by setting the SEL pin level. • 1/4 division ratio: Connect SEL to V CC. • 1/32 division ratio: Connect SEL to GND. OSC2 OSC1 System oscillator 1/4 or 1/32 division circuit* Timing generator circuit CPU with ROM, RAM, registers, flags, and I/O Peripheral function interrupt fcyc tcyc fOSC φ CPU φ PER Note: * 1/4 or 1/32 division ratio can be selected by SEL pin. Figure 17 Clock Generation Circuit OSC2 GND RESET OSC1 RE0 TEST GND Figure 18 Typical Layout of Ceramic Oscillator |
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