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PCF85263ATL/A Datasheet(PDF) 18 Page - NXP Semiconductors |
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PCF85263ATL/A Datasheet(HTML) 18 Page - NXP Semiconductors |
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18 / 100 page  PCF85263A All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 4.1 — 27 November 2015 18 of 100 NXP Semiconductors PCF85263A Tiny RTC with alarm, battery switch-over, and I2C-bus • write data (clear prescaler, A4h) • write data (100th seconds, 00h) • write data (Hours, 14h) • write data (Minutes, 23h) • write data (Seconds, 19h) • I2C START condition • I2C slave address + write (A2h) • register address (2Eh) • write data (clear STOP, 00h). Time starts counting from this point • I2C STOP condition 8.3 Stop-watch mode time registers These registers are coded in the BCD format to simplify application use. Stop-watch mode is enabled by setting RTCM = 1. In stop-watch mode, the PCF85263A counts from 100th seconds to 999999 hours. There are no days, weekdays, months or year registers. Default state is: Time — 000000:00:00.00 Monitor bits — OS = 1, EMON = 0 (see Section 8.2.2 on page 15 and Section 8.2.3 on page 15) [1] The 100th_seconds register is only available when the 100TH mode is enabled, see Section 8.13.1 on page 54. When the 100TH mode is disabled, this register always returns 0. 8.3.1 Setting and reading the time in stop-watch mode Figure 11 shows the data flow and data dependencies starting from the 100 Hz clock tick. During read operations, the time counting circuits (memory locations 00h through 07h) are copied into an output register. The RTC continues counting in the background. Table 12. Time registers in stop-watch mode (RTCM = 1) Bit positions labeled as - are not implemented and return 0 when read. Address Register name Upper-digit (ten’s place) Digit (unit place) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 00h 100th_seconds[1] 0 to 9 0 to 9 01h Seconds OS 0 to 5 0 to 9 02h Minutes EMON 0 to 5 0 to 9 03h Hours_xx_xx_00 0 to 9 0 to 9 04h Hours_xx_00_xx 0 to 9 0 to 9 05h Hours_00_xx_xx 0 to 9 0 to 9 06h not used -- -- -- -- 07h not used -- -- -- -- |
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