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參數(shù)資料
| 型號： | DS12887 |
| 英文描述： | Real Time Clock |
| 中文描述： | 實時時鐘 |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 584K |
| 代理商： | DS12887 |
DS12887
11 of 19
DSE
The Daylight Savings Enable (DSE) bit is a read/write bit which enables two special updates when DSE
is set to 1. On the first Sunday in April the time increments from 1:59:59 AM to 3:00:00 AM. On the last
Sunday in October when the time first reaches 1:59:59 AM it changes to 1:00:00 AM. These special
updates do not occur when the DSE bit is a 0. This bit is not affected by internal functions or
RESET
.
REGISTER C
MSB
BIT 7
IRQF
LSB
BIT 0
0
BIT 6
PF
BIT 5
AF
BIT 4
UF
BIT 3
0
BIT 2
0
BIT 1
0
IRQF
The Interrupt Request Flag (IRQF) bit is set to a 1 when one or more of the following are true:
PF = PIE = 1
AF = AIE = 1
UF = UIE = 1
That is, IRQF = PF
PIE + AF
AIE + UF
UIE.
Any time the IRQF bit is a 1, the
IRQ
pin is driven low. All flag bits are cleared after Register C is read
by the program or when the
RESET
pin is low.
PF
The Periodic Interrupt Flag (PF) is a read–only bit which is set to a 1 when an edge is detected on the
selected tap of the divider chain. The RS3 through RS0 bits establish the periodic rate. PF is set to a 1
independent of the state of the PIE bit. When both PF and PIE are 1s, the
IRQ
signal is active and will set
the IRQF bit. The PF bit is cleared by a
RESET
or a software read of Register C.
AF
A 1 in the Alarm Interrupt Flag (AF) bit indicates that the current time has matched the alarm time. If the
AIE bit is also a 1, the
IRQ
pin will go low and a 1 will appear in the IRQF bit. A
RESET
or a read of
Register C will clear AF.
UF
The Update Ended Interrupt Flag (UF) bit is set after each update cycle. When the UIE bit is set to 1, the
one in UF causes the IRQF bit to be a 1, which will assert the
IRQ
pin. UF is cleared by reading Register
C or a
RESET
.
BIT 0 THROUGH BIT 3
These are unused bits of the status Register C. These bits always read 0 and cannot be written.
REGISTER D
MSB
BIT 7
VRT
LSB
BIT 0
0
BIT 6
0
BIT 5
0
BIT 4
0
BIT 3
0
BIT 2
0
BIT 1
0
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS12B887 | Real Time Clock |
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| DS12C887 | Real Time Clock |
| DS1300-3 | 1300 Watts 12V Distributed Power System |
| DS1301-7R | 100 Watt DC-DC Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS12887+ | 功能描述:實時時鐘 RTC 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 |
| DS12887A | 功能描述:實時時鐘 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 |
| DS12887A+ | 功能描述:實時時鐘 RTC 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 |
| DS1290 | 功能描述:計數(shù)器移位寄存器 RoHS:否 制造商:Texas Instruments 計數(shù)器類型: 計數(shù)順序:Serial to Serial/Parallel 電路數(shù)量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數(shù)量:1 輸出類型:Open Drain 傳播延遲時間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel |
| DS12C887 | 功能描述:實時時鐘 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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