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參數(shù)資料
| 型號： | DS17487 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3 Volt/5 Volt Real Time Clock(3V/5V實時時鐘) |
| 文件頁數(shù)： | 18/32頁 |
| 文件大?。?/td> | 236K |
| 代理商： | DS17487 |
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DS17485/DS17487
030598 18/32
The RTC address is latched on the falling edge of the
ALE signal. Each time an RTC address is latched, the
register address stack is pushed. The stack is only four
registers deep, holding the three previous RTC
addresses in addition to the current RTC address being
accessed. The following waveform illustrates how the
BIOS could recover the RTC address when an SMI
occurs.
1
2
3
4
ALE
1. The RTC address is latched.
2. An SMI is generated before an RTC read or write occurs.
3. RTC address 0Ah is latched and the address from “1” is pushed to the “RTC Address – 1” stack location. This
step is necessary to change the bank select bit, DV0=1.
4. RTC address 4Eh is latched and the address from “1” is pushed to location 4Eh, “RTC Address – 2” while 0Ah is
pushed to the “RTC Address – 1” location. The data in this register, 4Eh, is the RTC address lost due to the SMI.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS17485 | 3 Volt/5 Volt Real Time Clock(3V/5V實時時鐘) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS17487-3 | 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 |
| DS17487-3+ | 功能描述:實時時鐘 3V/5V 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 |
| DS17487-3IND | 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 |
| DS17487-3IND+ | 功能描述:實時時鐘 3V/5V 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 |
| DS174875 | 制造商:Maxim Integrated Products 功能描述: |
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