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ATSAMB11XR 数据表(PDF) 20 Page - Microchip Technology |
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ATSAMB11XR 数据表(HTML) 20 Page - Microchip Technology |
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20 / 87 page  Table 6-3. RTC XO Interface Pin Name Function Register Default Digital Control Pins Pierce_res_ctrl Control feedback resistance value: 0 = 20 MOhm Feedback resistance 1 = 30 MOhm Feedback resistance 0X4000F404<15>=’1’ Pierce_cap_ctrl<3:0> Control the internal tuning capacitors with step of 700 fF: 0000=700 fF 1111=11.2 pF Refer to crystal datasheet to check for optimum tuning cap value 0X4000F404<23:20>=”1000” Pierce_gm_ctrl<3:0> Controls the Gm stage gain for different crystal mode: 0011= for crystal with shunt capacitance of 1.2 pF 1000= for crystal with shunt capacitance of >3 pF 0X4000F404<19:16>=”1000” VDD_XO 1.2V 6.3.3 RTC Characterization with Gm Code Variation at Supply 1.2V and Temp. = 25°C This section shows the RTC total drawn current and the XO accuracy versus different tuning capacitors and different GM codes, at a supply voltage of 1.2V and temperature = 25°C. Figure 6-3. RTC Drawn Current vs. Tuning Caps at 25°C ATSAMB11XR/ZR © 2017 Microchip Technology Inc. Datasheet Preliminary DS70005342A-page 20 |
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