參數(shù)資料
型號(hào)： M48T37Y-70MH1TR
廠(chǎng)商： STMICROELECTRONICS
元件分類(lèi)： 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, ROHS COMPLIANT, PLASTIC, SOH-44
文件頁(yè)數(shù)： 6/30頁(yè)
文件大?。?/td> 515K
代理商： M48T37Y-70MH1TR
Clock operations
M48T37Y, M48T37V
Doc ID 7019 Rev 9
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 backup
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 backup mode. The IRQ/FT will go low if
an alarm occurs and both the alarm in battery backup 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 backup mode alarm timing.
Figure 7.
Alarm interrupt reset waveform
Table 6.
Alarm repeat modes
RPT4
RPT3
RPT2
RPT1
Alarm activated
1
Once per second
1
0
Once per minute
1
0
Once per hour
1
0
Once per day
0
Once per month
AI01677B
A0-A14
ACTIVE FLAG BIT
ADDRESS 7FF0h
IRQ/FT
15ns Min
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參數(shù)描述
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(xiàn)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-70MH6E 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(xiàn)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-70MH6F 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(xiàn)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-70MH6TR 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM
M48T37YMH 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM
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