參數(shù)資料
型號(hào)： M48T37Y-10MH6TR
廠商： STMICROELECTRONICS
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 0 TIMER(S), REAL TIME CLOCK, PDSO44
封裝： 0.330 INCH, PLASTIC, SOIC-44
文件頁數(shù)： 6/29頁
文件大?。?/td> 276K
代理商： M48T37Y-10MH6TR
Clock operations
M48T37Y, M48T37V
3.4
Setting the alarm clock
Registers 7FF5h-7FF2h contain the alarm settings. The alarm can be configured to go off at
a predetermined time 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 M48T37Y/V is in the battery back-up
mode of operation to serve as a system wake-up call.
RPT1-RPT4 put the alarm in the repeat mode of operation. Table 6 shows the possible
configurations. Codes not listed in the table default to the once per second mode to quickly
alert the user of an incorrect alarm setting.
Note:
User must transition address (or toggle chip enable) to see Flag Bit change.
When the clock information matches the alarm clock settings based on the match criteria
defined by RPT1-RPT4, AF is set. If AFE is also set, the alarm condition activates the
IRQ/FT pin. To disable alarm, write '0' to the Alarm Date registers and RPT1-4. The alarm
flag and the IRQ/FT output are cleared by a READ to the Flags Register as shown in
Figure 7. A subsequent READ of the Flags Register is necessary to see that the value of the
Alarm Flag has been reset to '0.'
The IRQ/FT pin can also be activated in the battery back-up mode. The IRQ/FT will go low if
an alarm occurs and both the Alarm in Battery Back-up Mode Enable (ABE) and the AFE
are set. The ABE and AFE bits are reset during power-up, therefore an alarm generated
during power-up will only set AF. The user can read the Flag Register at system boot-up to
determine if an alarm was generated while the M48T37Y/V was in the deselect mode during
power-up. Figure 8 illustrates the back-up mode alarm timing.
Figure 7.
Alarm interrupt reset waveform
Table 6.
Alarm repeat modes
RPT4
RPT3
RPT2
RPT1
Alarm Activated
1
111
Once per Second
1
0
Once per Minute
1
0
Once per Hour
1
000
Once per Day
0
Once per Month
AI01677B
A0-A14
ACTIVE FLAG BIT
ADDRESS 7FF0h
IRQ/FT
15ns Min
相關(guān)PDF資料
PDF描述
M48T37V-70MH6E REAL TIME CLOCK, PDSO44
M48T37V-70MH6 0 TIMER(S), REAL TIME CLOCK, PDSO44
M48T37Y-70MH1F 0 TIMER(S), REAL TIME CLOCK, PDSO44
M48T37Y-70MH6TR 0 TIMER(S), REAL TIME CLOCK, PDSO44
M48T37Y-70MH1E 0 TIMER(S), REAL TIME CLOCK, PDSO44
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M48T37Y-70MH1 功能描述:實(shí)時(shí)時(shí)鐘 256K (32Kx8) 70ns 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
M48T37Y-70MH1E 功能描述:實(shí)時(shí)時(shí)鐘 256K (32Kx8) 70ns 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
M48T37Y-70MH1F 功能描述:實(shí)時(shí)時(shí)鐘 256K (32Kx8) 70ns 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
M48T37Y-70MH1TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER? SRAM
M48T37Y-70MH6 功能描述:實(shí)時(shí)時(shí)鐘 256K (32Kx8) 70ns 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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