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參數(shù)資料
| 型號： | DS17285E-5 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封裝： | TSOP-28 |
| 文件頁數(shù)： | 4/38頁 |
| 文件大?。?/td> | 415K |
| 代理商： | DS17285E-5 |
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DS17285/DS17287
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NONVOLATILE RAM - RTC
The general purpose nonvolatile RAM bytes are not dedicated to any special function within the
DS17285/DS17287. They can be used by the application program as nonvolatile memory and are fully
available during the update cycle.
The user RAM is divided into two separate memory banks. When the bank 0 is selected, the 14 real time
clock registers and 114 bytes of user RAM are accessible. When bank 1 is selected, an additional
2 kbytes of user RAM are accessible through the extended RAM address and data registers.
INTERRUPT CONTROL
The DS17285/DS17287 includes six separate, fully automatic sources of interrupt for a processor:
1. Alarm interrupt
2. Periodic interrupt
3. Update-ended interrupt
4. Wake-up interrupt
5. Kickstart interrupt
6. RAM clear interrupt
The conditions which generate each of these independent interrupt conditions are described in greater
detail elsewhere in this data sheet. This section describes the overall control of the interrupts.
The application software can select which interrupts, if any, are to be used. There are a total of 6 bits,
including 3 bits in Register B and 3 bits in Extended Register 4B, which enable the interrupts. The
extended register locations are described later. Writing a logic 1 to an interrupt enable bit permits that
interrupt to be initiated when the event occurs. A logic 0 in the interrupt enable bit prohibits the IRQ pin
from being asserted from that interrupt condition. If an interrupt flag is already set when an interrupt is
enabled, IRQ will immediately be set at an active level, even though the event initiating the interrupt
condition may have occurred much earlier. As a result, there are cases where the software should clear
these earlier generated interrupts before first enabling new interrupts.
When an interrupt event occurs, the relating flag bit is set to a logic 1 in Register C or in Extended
Register 4A. These flag bits are set regardless of the setting of the corresponding enable bit located either
in Register B or in Extended Register 4B. The flag bits can be used in a polling mode without enabling
the corresponding enable bits.
However, care should be taken when using the flag bits of Register C as they are automatically cleared to
0 immediately after they are read. Double latching is implemented on these bits so that bits which are set
remain stable throughout the read cycle. All bits which were set are cleared when read and new interrupts
which are pending during the read cycle are held until after the cycle is completed. One, 2, or 3 bits can
be set when reading Register C. Each utilized flag bit should be examined when read to ensure that no
interrupts are lost.
The flag bits in Extended Register 4A are not automatically cleared following a read. Instead, each flag
bit can be cleared to 0 only by writing 0 to that bit.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS17285S-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS17285SN-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS17285EN-3 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| DS17285S-3 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS1742-100 | 0 TIMER(S), REAL TIME CLOCK, PDIP24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS17285E-5+ | 功能描述:實時時鐘 3V/5V RTC K Multiplexed Kick-S 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 |
| DS17285EN- | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Real-Time Clocks |
| DS17285EN-3 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS17285EN-3+ | 功能描述:實時時鐘 3V/5V RTC K Multiplexed Kick-S 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 |
| DS17285EN-5 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Real-Time Clock |
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