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PCF2127T/2Y Datasheet(PDF) 60 Page - NXP Semiconductors |
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PCF2127T/2Y Datasheet(HTML) 60 Page - NXP Semiconductors |
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60 / 100 page  PCF2127 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 8 — 19 December 2014 60 of 100 NXP Semiconductors PCF2127 Accurate RTC with integrated quartz crystal for industrial applications 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 restarting the time circuits is between 0 and one 64 Hz cycle (0.484375 s and 0.500000 s), see Table 84 and Figure 34. [1] F0 is clocked at 32.768 kHz. Fig 33. STOP bit functional diagram Table 84. 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 |
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