PCF8564AU/5BB/1 查看數據表（PDF） - NXP Semiconductors.

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PCF8564AU/5BB/1

Real time clock and calendar

NXP Semiconductors. 

NXP Semiconductors

PCF8564A

Real time clock and calendar

The VL flag is intended to detect the situation when VDD is decreasing slowly, for example

under battery operation. Should the oscillator stop or VDD reach Vlow before power is

re-asserted, then the VL flag will be set. This indicates that the time is possibly corrupted.

8.4.2 Register Minutes

Table 11. Minutes - minutes register (address 03h) bit description

Bit Symbol Value Place value Description

7

-

-

-

unused

6 to 4 MINUTES 0 to 5 ten’s place actual minutes coded in BCD format

3 to 0

0 to 9 unit place

8.4.3 Register Hours

Table 12. Hours - hours register (address 04h) bit description

Bit Symbol Value Place value Description

7 to 6 -

-

-

unused

5 to 4 HOURS 0 to 2 ten’s place actual hours coded in BCD format

3 to 0

0 to 9 unit place

8.4.4 Register Days

Table 13. Days - days register (address 05h) bit description

Bit Symbol Value Place value Description

7 to 6 -

-

-

unused

5 to 4 DAYS[1] 0 to 3 ten’s place actual day coded in BCD format

3 to 0

0 to 9 unit place

[1] The PCF8564A compensates for leap years by adding a 29th day to February if the year counter contains a

value which is exactly divisible by 4, including the year 00.

8.4.5 Register Weekdays

Table 14. Weekdays - weekdays register (address 06h) bit description

Bit Symbol

Value Description

7 to 3 -

-

unused

2 to 0 WEEKDAYS

0 to 6 actual weekday values, see Table 15

PCF8564A

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 3 — 26 August 2013

© NXP B.V. 2013. All rights reserved.

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