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参数资料
| 型号： | DS12C887 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| 封装： | ENCAPSULATED, DIP-24 |
| 文件页数： | 7/22页 |
| 文件大小： | 356K |
| 代理商： | DS12C887 |
DS12885/DS12887/DS12887A/DS12C887/DS12C887A
Real-Time Clock
____________________________________________________________________
15
Bit 7: Update-In-Progress (UIP). This bit is a status
flag that can be monitored. When the UIP bit is a 1, the
update transfer occurs soon. When UIP is a 0, the
update transfer does not occur for at least 244s. The
time, calendar, and alarm information in RAM is fully
available for access when the UIP bit is 0. The UIP bit is
read-only and is not affected by RESET. Writing the
SET bit in Register B to a 1 inhibits any update transfer
and clears the UIP status bit.
Bits 6, 5, and 4: DV2, DV1, DV0. These three bits are
used to turn the oscillator on or off and to reset the
countdown chain. A pattern of 010 is the only combina-
tion of bits that turn the oscillator on and allow the RTC
to keep time. A pattern of 11x enables the oscillator but
holds the countdown chain in reset. The next update
occurs at 500ms after a pattern of 010 is written to DV0,
DV1, and DV2.
Bits 3 to 0: Rate Selector (RS3, RS2, RS1, RS0).
These four rate-selection bits select one of the 13 taps
on the 15-stage divider or disable the divider output.
The tap selected can be used to generate an output
square wave (SQW pin) and/or a periodic interrupt. The
user can do one of the following:
1)
Enable the interrupt with the PIE bit;
2)
Enable the SQW output pin with the SQWE bit;
3)
Enable both at the same time and the same rate;
or
4)
Enable neither.
Table 3 lists the periodic interrupt rates and the square-
wave frequencies that can be chosen with the RS bits.
These four read/write bits are not affected by RESET.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
UIP
DV2
DV1
DV0
RS3
RS2
RS1
RS0
Control Register A
Control Registers
The real-time clocks have four control registers that are
accessible at all times, even during the update cycle.
MSB
LSB
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PDF描述 |
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| DS12887 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS1302S | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| DS1302N | 0 TIMER(S), REAL TIME CLOCK, PDIP8 |
| DS1302SN | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS12C887+ | 功能描述:实时时钟 RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12C887A | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12C887A+ | 功能描述:实时时钟 RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12CR887-33 | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12CR887-33+ | 功能描述:实时时钟 RTC w/Constant V Trickle Charger RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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