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PCF2127AT/1 Datasheet(PDF) 52 Page - NXP Semiconductors |
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PCF2127AT/1 Datasheet(HTML) 52 Page - NXP Semiconductors |
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52 / 80 page  PCF2127A_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 52 of 80 NXP Semiconductors PCF2127A Integrated RTC, TCXO and quartz crystal 8.15 STOP bit function The function of the STOP bit is to allow for accurate starting of the time circuits. STOP will cause the upper part of the prescaler (F9 to F14) to be held in reset and thus no 1 Hz ticks are generated. The time circuits can then be set and will not increment until the STOP bit is released. STOP will not affect the CLKOUT signal but the output of the prescaler in the range of 32 Hz to 1 Hz (see Figure 31). The lower stages of the prescaler, F0 to F8, are not reset and because the I2C-bus and the SPI-bus are asynchronous to the crystal oscillator, the accuracy of re-starting the time circuits is between 0 and one 64 Hz cycle (0.484375 s and 0.500000 s), see Table 55 and Figure 32. [1] F0 is clocked at 32.768 kHz. Table 55. First increment of time circuits after stop release Bit STOP Prescaler bits[1] F0 to F8 - F9 to F14 1Hz tick Time hh:mm:ss Comment Clock is running normally 0 010000111-010100 12:45:12 prescaler counting normally STOP bit is activated by user. F0 to F8 are not reset and values cannot be predicted externally 1 xxxxxxxxx-000000 12:45:12 prescaler is reset; time circuits are frozen New time is set by user 1 xxxxxxxxx-000000 08:00:00 prescaler is reset; time circuits are frozen STOP bit is released by user 0 xxxxxxxxx-000000 08:00:00 prescaler is now running 0 xxxxxxxxx-100000 08:00:00 0 xxxxxxxxx-100000 08:00:00 0 xxxxxxxxx-110000 08:00:00 :: : 0 111111111-111110 08:00:00 0 000000000-000001 08:00:01 0 to 1 transition of F14 increments the time circuits 0 100000000-000001 08:00:01 :: : 0 111111111-111111 08:00:01 0 000000000-000000 08:00:01 0 100000000-000000 :: : 0 111111111-111110 08:00:01 0 000000000-000001 08:00:02 0 to 1 transition of F14 increments the time circuits 001aaj479 |
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