參數(shù)資料
型號(hào)： DS17887-5
廠商： DALLAS SEMICONDUCTOR
元件分類： Timer or RTC
英文描述： 1 TIMER(S), REAL TIME CLOCK, DMA24
封裝： PLASTIC, MODULE, DIP-24
文件頁(yè)數(shù)： 16/38頁(yè)
文件大?。?/td> 407K
代理商： DS17887-5
DS17885/DS17887
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
DS17885-3 1 TIMER(S), REAL TIME CLOCK, PDIP24
DS17885S-5 1 TIMER(S), REAL TIME CLOCK, PDSO24
DS17885E-5 1 TIMER(S), REAL TIME CLOCK, PDSO28
DS1821+ DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT
DS1821S+ DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS17887-5 IND 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
DS17887-5+ 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
DS17887-5IND 功能描述:IC RTC 5V 8K NV RAM 24-EDIP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件
DS17887-5IND+ 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
DS17H531D 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:3-PHASE STEPPING SYSTEMS
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