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參數(shù)資料
| 型號(hào)： | DS12C887 |
| 英文描述： | Real Time Clock |
| 中文描述： | 實(shí)時(shí)時(shí)鐘 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大小： | 193K |
| 代理商： | DS12C887 |
DS12C887
9 of 19
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
i.e., IRQF = (PF
●
PIE) + (AF
●
AIE) + (UF
●
UIE)
Any time the IRQF bit is a 1, the
IRQ
pin is driven low. Flag bits PF, AF, and UF 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 1’s, the
IRQ
signal is active and will
set the IRQF bit. The PF bit is cleared by a software read of Register C or a RESET .
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 1 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 3 THROUGH BIT 0 -
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
VRT
- The Valid RAM and Time (VRT) bit indicates the condition of the battery connected to the V
BAT
pin. This bit is not writeable and should always be a 1 when read. If a 0 is ever present, an exhausted
internal lithium energy source is indicated and both the contents of the RTC data and RAM data are
questionable. This bit is unaffected by RESET
.
BIT 6 THROUGH BIT 0 -
The remaining bits of Register D are not usable. They cannot be written and,
when read, they will always read 0.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS12C887+ | 功能描述:實(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12C887A | 功能描述:實(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12C887A+ | 功能描述:實(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12CR887-33 | 功能描述:實(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12CR887-33+ | 功能描述:實(shí)時(shí)時(shí)鐘 RTC w/Constant V Trickle Charger 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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