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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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SH7052 bảng dữ liệu(PDF) 81 Page - Renesas Technology Corp |
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SH7052 bảng dữ liệu(HTML) 81 Page - Renesas Technology Corp |
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81 / 919 page  55 Section 4 Clock Pulse Generator (CPG) 4.1 Overview The clock pulse generator (CPG) supplies clock pulses inside the SH7052F/SH7053F/SH7054F chip and to external devices. The SH7052F/SH7053F/SH7054F 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 4 times the oscillator frequency is generated by the PLL multiplier circuit. The CPG is halted in software standby mode and hardware standby mode. 4.1.1 Block Diagram A block diagram of the clock pulse generator is shown in figure 4.1. Oscillator circuit CPG EXTAL XTAL PLLVcc PLLVss PLLCAP CK (system clock) Internal clock f × 4 PLL multiplier circuit Figure 4.1 Block Diagram of Clock Pulse Generator |
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