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PCF2129AT 数据表(PDF) 53 Page - NXP Semiconductors |
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PCF2129AT 数据表(HTML) 53 Page - NXP Semiconductors |
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53 / 86 page  PCF2129 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 7 — 19 December 2014 53 of 86 NXP Semiconductors PCF2129 Accurate RTC with integrated quartz crystal for industrial applications In this example, the Seconds register is set to 45 seconds and the Minutes register to 10 minutes. Fig 31. SPI-bus write example In this example, the registers Months and Years are read. The pins SDI and SDO are not connected together. For this configuration, it is important that pin SDI is never left floating. It must always be driven either HIGH or LOW. If pin SDI is left open, high IDD currents may result. Fig 32. SPI-bus read example |
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