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SH7050 датащи(PDF) 73 Page - Renesas Technology Corp |
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SH7050 датащи(HTML) 73 Page - Renesas Technology Corp |
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73 / 841 page ![]() Section 4 Clock Pulse Generator (CPG) Rev. 5.00 Jan 06, 2006 page 53 of 818 REJ09B0273-0500 Section 4 Clock Pulse Generator (CPG) 4.1 Overview The clock pulse generator (CPG) supplies clock pulses inside the SH7050 series chip and to external devices. The SH7050 series CPG consists of an oscillator circuit and a PLL multiplier circuit. There are two methods of generating a clock with the CPG: by connecting a crystal resonator, or by inputting an external clock. The oscillator circuit oscillates at the same frequency as the input clock. A chip operating frequency of 1, 2, or 4 times the oscillator frequency can be selected by means of the PLL multiplier circuit. The CPG is halted in software standby mode and hardware standby mode. |
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