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參數(shù)資料
| 型號(hào)： | DS17485-5 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁數(shù)： | 16/38頁 |
| 文件大?。?/td> | 400K |
| 代理商： | DS17485-5 |
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DS17485/DS17487
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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 |
|---|---|
| DS17485S-3 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS17485S-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS17485E-3 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| DS17485SN-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS17487-3 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS17485-5+ | 功能描述:實(shí)時(shí)時(shí)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(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 |
| DS1748555 | 制造商:Maxim Integrated Products 功能描述: |
| DS17485-DS17487 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Real-Time Clock |
| DS17485E3 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Real-Time Clocks |
| DS17485E-3 | 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 |
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