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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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R8C2K bảng dữ liệu(PDF) 375 Page - Renesas Technology Corp |
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R8C2K bảng dữ liệu(HTML) 375 Page - Renesas Technology Corp |
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375 / 471 page  R8C/2K Group, R8C/2L Group 19. A/D Converter Rev.1.10 Dec 21, 2007 Page 358 of 450 REJ09B0406-0110 19.3 Sample and Hold When the SMP bit in the ADCON2 register is set to 1 (sample and hold function enabled), the A/D conversion rate per pin increases. The sample and hold function is available in all operating modes. Start A/D conversion after selecting whether the sample and hold circuit is to be used or not. Figure 19.8 shows a Timing Diagram of A/D Conversion. Figure 19.8 Timing Diagram of A/D Conversion 19.4 A/D Conversion Cycles Figure 19.9 shows the A/D Conversion Cycles. Figure 19.9 A/D Conversion Cycles Sampling time 4ø AD cycles Sample and hold disabled Conversion time of 1st bit 2nd bit Comparison time Sampling time 2.5ø AD cycles Comparison time Sampling time 2.5ø AD cycles Comparison time * Repeat until conversion ends Sampling time 4ø AD cycles Sample and hold enabled Conversion time of 1st bit 2nd bit Comparison time Comparison time Comparison time * Repeat until conversion ends Comparison time A/D Conversion Mode Without Sample & Hold Without Sample & Hold With Sample & Hold With Sample & Hold 8 bits 10 bits 8 bits 10 bits Conversion Time Comparison Time Comparison Time End process Sampling Time End process Conversion time at the 1st bit Sampling Time Conversion time at the 2nd bit and the follows 49 φAD 4 φAD 2.0 φAD 2.5 φAD 2.5 φAD 8.0 φAD 59 φAD 4 φAD 2.0 φAD 2.5 φAD 2.5 φAD 8.0 φAD 28 φAD 4 φAD 2.5 φAD 0.0 φAD 2.5 φAD 4.0 φAD 33 φAD 4 φAD 2.5 φAD 0.0 φAD 2.5 φAD 4.0 φAD |
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