參數(shù)資料
型號(hào)： DS14285S
英文描述： Real Time Clock with NV RAM Control
中文描述： 實(shí)時(shí)時(shí)鐘的非易失RAM控制
文件頁(yè)數(shù)： 10/25頁(yè)
文件大?。?/td> 303K
代理商： DS14285S
DS14285/DS14287
10 of 25
CONTROL REGISTERS
The DS14285/DS14287 has four control registers which are accessible at all times, even during the
update cycle.
REGISTER A
MSB
BIT 7
UIP
LSB
BIT 6
DV2
BIT 5
DV1
BIT 4
DV0
BIT 3
RS3
BIT 2
RS2
BIT 1
RS1
BIT 0
RS0
UIP -
The Update In Progress (UIP) bit is a status flag that can be monitored. When the UIP bit is a 1, the
update transfer will soon occur. When UIP is a 0, the update transfer will not occur for at least 244
μ
s.
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.
DV0, DV1, DV2 -
These 3 bits are used to turn the oscillator on or off and to reset the countdown chain.
A pattern of 010 is the only combination of bits that will turn the oscillator on and allow the RTC to keep
time. A pattern of 11X will enable the oscillator but holds the countdown chain in reset. The next update
will occur at 500 ms after a pattern of 010 is written to DV0, DV1, and DV2.
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 2 lists the periodic interrupt rates and the square wave frequencies that can be chosen with the RS
bits. These 4 read/write bits are not affected by
RESET
.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS14285S/T&R 制造商:Maxim Integrated Products 功能描述:IC RTC W/NV RAM CNTRL 24-SOIC
DS14285S/T&R 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
DS14285S/TR 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Real-Time Clock with NV RAM
DS14285S+ 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
DS14285S+T&R 制造商:Maxim Integrated Products 功能描述:IC RTC W/NV RAM CNTRL 24-SOIC
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