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PCF85063ATL/1 Datasheet(PDF) 9 Page - NXP Semiconductors |
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PCF85063ATL/1 Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 55 page ![]() NXP Semiconductors PCF85063A Tiny Real-Time Clock/calendar with alarm function and I2C-bus 7.2.1.3 Software reset A reset is automatically generated at power-on. There is a low probability that some devices will have corruption of the registers after the automatic power-on reset if the device is powered up with a residual VDD level. It is required that the VDD starts at zero volts at power up or upon power cycling to ensure that there is no corruption of the registers. If this is not possible, a reset must be initiated after power-up (i.e. when power is stable) with the software reset command. Software reset command means setting bits 6, 4, and 3 in register Control_1 (00h) logic 1 and all other bits logic 0 by sending the bit sequence 01011000 (58h), see Figure 8. s 1 0 1 0 0 0 1 0 A 0 0 0 0 0 0 0 0 A 0 1 0 1 1 0 0 0 A P/S SDA SCL slave address address 00h software reset 58h R/W aaa-004418 internal reset signal After sending the software reset command, it is recommended to re-initialize the interface by a STOP and START. Figure 8. Software reset command In reset state, all registers are set according to Table 7 and the address pointer returns to address 00h. Bit Address Register name 7 6 5 4 3 2 1 0 00h Control_1 0 0 0 0 0 0 0 0 01h Control_2 0 0 0 0 0 0 0 0 02h Offset 0 0 0 0 0 0 0 0 03h RAM_byte 0 0 0 0 0 0 0 0 04h Seconds 1 0 0 0 0 0 0 0 05h Minutes 0 0 0 0 0 0 0 0 06h Hours 0 0 0 0 0 0 0 0 07h Days 0 0 0 0 0 0 0 1 08h Weekdays 0 0 0 0 0 1 1 0 09h Months 0 0 0 0 0 0 0 1 0Ah Years 0 0 0 0 0 0 0 0 0Bh Second_alarm 1 0 0 0 0 0 0 0 0Ch Minute_alarm 1 0 0 0 0 0 0 0 0Dh Hour_alarm 1 0 0 0 0 0 0 0 0Eh Day_alarm 1 0 0 0 0 0 0 0 0Fh Weekday_alarm 1 0 0 0 0 0 0 0 10h Timer_value 0 0 0 0 0 0 0 0 Table 7. Registers reset values PCF85063A All information provided in this document is subject to legal disclaimers. © 2023 NXP B.V. All rights reserved. Product data sheet Rev. 7.1 — 8 November 2023 9 / 55 |
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