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參數(shù)資料
| 型號： | DS1553-70 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| 封裝： | 0.740 INCH, ENCAPSULATED, DIP-28 |
| 文件頁數(shù)： | 24/25頁 |
| 文件大?。?/td> | 546K |
| 代理商： | DS1553-70 |
DS1553 64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM
8 of 23
USING THE CLOCK ALARM
The alarm settings and control for the DS1553 reside within registers 1FF2h–1FF5h. Register 1FF6h
contains two alarm-enable bits: Alarm Enable (AE) and Alarm in Backup Enable (ABE). The AE and
ABE bits must be set as described below for the IRQ /FT output to be activated for a matched alarm
condition.
The alarm can be programmed to activate on a specific day of the month or repeat every day, hour,
minute, or second. It can also be programmed to go off while the DS1553 is in the battery-backed state of
operation to serve as a system wakeup. Alarm mask bits AM1–AM4 control the alarm mode. Table 3
shows the possible settings. Configurations not listed in the table default to the once-per-second mode to
notify the user of an incorrect alarm setting.
Table 3. Alarm Mask Bits
AM4
AM3
AM2
AM1
ALARM RATE
1
Once per second
1
0
When seconds match
1
0
When minutes and seconds match
1
0
When hours, minutes, and seconds match
0
When date, hours, minutes, and seconds match
When the RTC register values match Alarm register settings, the Alarm Flag bit (AF) is set to 1. If the
Alarm Flag Enable (AE) is also set to 1, the alarm condition activates the IRQ /FT pin. The IRQ /FT signal
is cleared by a read or write to the Flags register (Address 1FF0h) as shown in Figures 2 and 3. When CE
is active, the IRQ /FT signal may be cleared by having the address stable for as short as 15ns and either
OE
or WE active, but it is not guaranteed to be cleared unless tRC is fulfilled. The alarm flag is also
cleared by a read or write to the Flags register, but the flag does not change states until the end of the
read/write cycle and the IRQ /FT signal has been cleared.
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| DS1553WP-150 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1553WP-120 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1553-100 | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
| DS1553W-120 | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
| DS1553P-100 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1553-70+ | 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 |
| DS1553-85+ | 功能描述:實時時鐘 64kB NV RAM Timekeeper 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 |
| DS1553P | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM |
| DS1553P/YP/WP | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:PowerCap with Crystal |
| DS1553P-100 | 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 |
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