PCF8564AU/5BB/1 查看數據表（PDF） - NXP Semiconductors.
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PCF8564AU/5BB/1 Datasheet PDF : 48 Pages
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NXP Semiconductors
PCF8564A
Real time clock and calendar
8.4 Time and date registers
The majority of the registers are coded in the BCD format to simplify application use.
8.4.1 Register Seconds
Table 9. Seconds - seconds and clock integrity status register (address 02h) bit
description
Bit Symbol Value Place value Description
7
VL
0
-
clock integrity is guaranteed
1[1]
-
integrity of the clock information is not guaranteed
6 to 4 SECONDS 0 to 5 ten’s place actual seconds coded in BCD format, see Table 10
3 to 0
0 to 9 unit place
[1] Start-up value.
Table 10. Seconds coded in BCD format
Seconds value in Upper-digit (ten’s place)
decimal
Bit 6
Bit 5
Bit 4
00
0
0
0
01
0
0
0
02
0
0
0
:
09
0
0
0
10
0
0
1
:
58
1
0
1
59
1
0
1
Digit (unit place)
Bit 3
Bit 2
0
0
0
0
0
0
Bit 1
0
0
1
1
0
0
0
0
0
1
0
0
1
0
0
Bit 0
0
1
0
1
0
0
1
8.4.1.1 Voltage low detector and clock monitor
The PCF8564A has an on-chip voltage low detector. When VDD drops below Vlow the VL
(Voltage Low) flag is set to indicate that the integrity of the clock information is no longer
guaranteed. The VL flag can only be cleared by command.
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Fig 4. Voltage low detection
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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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