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參數(shù)資料
| 型號： | DS1543-70 |
| 英文描述： | 64k NV Timekeeping RAM |
| 中文描述： | 64K的非易失內(nèi)存時鐘 |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 199K |
| 代理商： | DS1543-70 |
DS1543
7 of 17
When the RTC register values match alarm register settings, the Alarm Flag bit (AF) is set to a 1. If
Alarm Flag Enable (AE) is also set to a 1, the alarm condition activates the
IRQ
/FT pin. The
IRQ
/FT
signal is cleared by a read or write to the Flags register (Address 1FF0h) as shown in Figure 2. The
IRQ
/FT signal may be cleared by having the address stable for as short as 15 ns and either
CE
or
WE
active, but is not guaranteed to be cleared unless t
RC
is fulfilled. The alarm flag is also cleared by a read
or write to the Flags register, but the flag will not change states until the end of the read/write cycle and
the
IRQ
/FT signal has been cleared.
CLEARING IRQ WAVEFORMS
Figure 2
CLEARING IRQ WAVEFORMS
Figure 3
The
IRQ
/FT pin can also be activated in the battery-backed mode. The
IRQ
/FT will go low if an alarm
occurs and both ABE and AE are set. The ABE and AE bits are cleared during the power-up transition,
however an alarm generated during power-up will set AF. Therefore the AF bit can be read after system
power-up to determine if an alarm was generated during the power-up sequence. Figure 4 illustrates
alarm timing during the battery backup mode and power-up states.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1543W-100 | 64k NV Timekeeping RAM |
| DS1543W-70 | 64k NV Timekeeping RAM |
| DS1543P | 64K NV Real Time Clocks RAM |
| DS1554-100 | 256K NV Y2KC Timekeeping RAM |
| DS1554-70 | 256K NV Y2KC Timekeeping RAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1543-85 | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1543-85+ | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1543P | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:64K NV Real Time Clocks RAM |
| DS1543P-100 | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1543P-100+ | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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