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參數(shù)資料
| 型號： | PCF8563 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Real-time clock/calendar(實時時鐘/日歷) |
| 中文描述： | 實時時鐘/日歷（實時時鐘/日歷） |
| 文件頁數(shù)： | 5/30頁 |
| 文件大?。?/td> | 676K |
| 代理商： | PCF8563 |
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Philips Semiconductors
PCF8563
Real-time clock/calendar
Product specification
16 April 1999
5 of 30
9397 750 04855
Philips Electronics N.V. 1999. All rights reserved.
8.4 Reset
The PCF8563 includes an internal reset circuit which is active whenever the oscillator
is stopped. In the reset state the I
2
C-bus logic is initialized and all registers, including
the address pointer, are cleared with the exception of bits FE, VL, TD1, TD0, TESTC
and AE which are set to logic 1.
8.5 Voltage-low detector and clock monitor
The PCF8563 has an on-chip voltage-low detector. When V
DD
drops below V
low
the
VL bit (Voltage Low, bit 7 in the Seconds register) is set to indicate that reliable
clock/calendar information is no longer guaranteed. The VL flag can only be cleared
by software.
The VL bit is intended to detect the situation when V
DD
is decreasing slowly for
example under battery operation. Should V
DD
reach V
low
before power is re-asserted
then the VL bit will be set. This will indicate that the time may be corrupted.
8.6 Register organization
Fig 4.
Voltage-low detection.
handbook, halfpage
VL set
normal power
operation
period of battery
operation
t
Vlow
MGR887
Table 4:
Bit positions labelled as ‘
’are not implemented; those labelled with ‘0’ should always be written with logic 0.
Address Register name
Bit 7
Bit 6
00H
Control/Status 1
TEST1
0
01H
Control/Status 2
0
0
0DH
CLKOUT frequency
FE
0EH
Timer control
TE
0FH
Timer countdown
value
Registers overview
Bit 5
STOP
0
Bit 4
0
TI/TP
Bit 3
TESTC
AF
Bit 2
0
TF
Bit 1
0
AIE
FD1
TD1
Bit 0
0
TIE
FD0
TD0
<timer countdown value>
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCF8566 | Universal LCD driver for low multiplex rates |
| PCF8573 | Clock/calendar with Power Fail Detector |
| PCF8573P | Clock/calendar with Power Fail Detector |
| PCF8573T | Clock/calendar with Power Fail Detector |
| PCF8574 | Remote 8-bit I/O expander for I2C-bus |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCF8563_11 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Real-time clock/calendar |
| PCF8563BS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Real-time clock/calendar |
| PCF8563BS/4 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Real-time clock/calendar |
| PCF8563BS/4,118 | 功能描述:實時時鐘 ULTRA LOW POWER RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| PCF8563BS/4-T | 功能描述:實時時鐘 ULTRA LOW POWER CLOCK CALENDAR RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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