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参数资料
| 型号： | DS1553-70 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| 封装： | 0.740 INCH, ENCAPSULATED, DIP-28 |
| 文件页数： | 24/25页 |
| 文件大小： | 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.
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1553-70+ | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1553-85+ | 功能描述:实时时钟 64kB NV RAM Timekeeper RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1553P | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM |
| DS1553P/YP/WP | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:PowerCap with Crystal |
| DS1553P-100 | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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