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參數(shù)資料
| 型號： | DS17485S-5 |
| 英文描述： | 3V/5V Real-Time Clock |
| 中文描述： | 3V/5V實時時鐘 |
| 文件頁數(shù)： | 23/38頁 |
| 文件大?。?/td> | 427K |
| 代理商： | DS17485S-5 |
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DS17485/DS17487
23 of 38
SYSTEM MAINTENANCE INTERRUPT (SMI) RECOVERY STACK
An SMI recovery register stack is located in the extended register bank, locations 4Eh and 4Fh. This
register stack, shown below, can be used by the BIOS to recover from an SMI occurring during an RTC
read or write.
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) 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 |
|---|---|
| DS17485SN-3 | 3V/5V Real-Time Clock |
| DS17485SN-5 | 3V/5V Real-Time Clock |
| DS17487 | 3V/5V Real-Time Clock |
| DS17487-3 | 3V/5V Real-Time Clock |
| DS17487-5 | 3V/5V Real-Time Clock |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS17485S-5/T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC 5V 4K NV RAM 24-SOIC |
| DS17485S-5/T&R/C01 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS17485S-5/T&R | 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 |
| DS17485S-5+ | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS17485S-5+T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 4KBYTE 24SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC 5V 4K NV RAM 24-SOIC |
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