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PCF2129A Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCF2129A Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 69 page  PCF2129A_2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 02 — 7 May 2010 6 of 69 NXP Semiconductors PCF2129A Integrated RTC, TCXO and quartz crystal 8.1 Register overview The PCF2129A contains 28 8-bit registers (see Table 4) with an auto-incrementing address register: the built-in address register will increment automatically after each read or write of a data byte up to the register 1Bh. After register 1Bh the auto-incrementing will wrap around to address 00h (see Figure 3). • The first three registers (memory address 00h, 01h, and 02h) are used as control registers (see Section 8.2). • The memory addresses 03h through to 09h are used as counters for the clock function (seconds up to years). The date is automatically adjusted for months with fewer than 31 days, including corrections for leap years. The clock can operate in 12-hour mode with an AM/PM indication or in 24-hour mode (see Section 8.8). • Addresses 0Ah through 0Eh define the alarm function. It can be selected that an interrupt is generated when an alarm event occurs (see Section 8.9). • The register 0Fh defines the temperature measurement period and the clock out mode. The temperature measurement can be selected from every 4 minutes (default) down to every 30 seconds (see Table 9). CLKOUT frequencies of 32.768 kHz (default) down to 1 Hz for use as a system clock, a microcontroller clock etc. can be chosen (see Table 10). • Address registers 10h and 11h are used for the watchdog timer functions. The watchdog timer has four selectable source clocks allowing for timer periods from less than 1 ms to greater than 4 hours (see Table 32). An interrupt will be generated when the watchdog times out. • Address registers 12h to 18h are used for the timestamp function. When the trigger event happens, the actual time is saved in the timestamp registers (see Section 8.11). • Address register 19h is used for the correction of the crystal aging effect (see Section 8.4.1). • Address registers 1Ah and 1Bh are for internal use only. • The registers Seconds, Minutes, Hours, Days, Months, and Years are all coded in Binary Coded Decimal (BCD) format to simplify application use. Other registers are either bit-wise or standard binary. When one of the RTC registers is written or read, the content of all counters is temporarily frozen. This prevents a faulty writing or reading of the clock and calendar during a carry condition (see Section 8.8.8). Fig 3. Handling address registers 001aaj398 address register 00h auto-increment wrap around 01h 02h 03h ... 19h 1Ah 1Bh |
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