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PCF85063ATL Datasheet(PDF) 4 Page - NXP Semiconductors |
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PCF85063ATL Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 54 page PCF85063ATL All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 2 — 15 April 2013 4 of 54 NXP Semiconductors PCF85063ATL Tiny Real-Time Clock/calendar with alarm function and I2C-bus 8. Functional description The PCF85063ATL contains 18 8-bit registers with an auto-incrementing register address, an on-chip 32.768 kHz oscillator with integrated capacitors, a frequency divider which provides the source clock for the Real-Time Clock (RTC) and calender, and an I2C-bus interface with a maximum data rate of 400 kbit/s. The built-in address register will increment automatically after each read or write of a data byte up to the register 11h. After register 11h, the auto-incrementing will wrap around to address 00h (see Figure 3). All registers (see Table 5) are designed as addressable 8-bit parallel registers although not all bits are implemented. The first two registers (memory address 00h and 01h) are used as control and status register. The register at address 02h is an offset register allowing the fine-tuning of the clock; and at 03h is a free RAM byte. The addresses 04h through 0Ah are used as counters for the clock function (seconds up to years counters). Address locations 0Bh through 0Fh contain alarm registers which define the conditions for an alarm. The registers at 10h and 11h are for the timer function. The Seconds, Minutes, Hours, Days, Months, and Years as well as the corresponding alarm registers are all coded in Binary Coded Decimal (BCD) format. When one of the RTC registers is written or read, the contents of all time counters are frozen. Therefore, faulty writing or reading of the clock and calendar during a carry condition is prevented. For details on maximum access time, see Section 8.4 on page 22. Fig 3. Handling address registers DDD DGGUHVVUHJLVWHU K DXWRLQFUHPHQW ZUDSDURXQG K K K )K K K |
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