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参数资料
| 型号： | M48T37V-10MH1TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| 封装： | 0.330 INCH, ROHS COMPLIANT, PLASTIC, SOH-44 |
| 文件页数： | 4/30页 |
| 文件大小： | 515K |
| 代理商： | M48T37V-10MH1TR |
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Clock operations
M48T37Y, M48T37V
Doc ID 7019 Rev 9
3
Clock operations
3.1
Reading the clock
Updates to the TIMEKEEPER registers should be halted before clock data is read to
prevent reading data in transition. The BiPORT TIMEKEEPER cells in the RAM array are
only data registers and not the actual clock counters, so updating the registers can be halted
without disturbing the clock itself.
Updating is halted when a '1' is written to the READ bit, D6 in the control register 7FF8h. As
long as a '1' remains in that position, updating is halted. After a halt is issued, the registers
reflect the count; that is, the day, date, and the time that were current at the moment the halt
command was issued.
All of the TIMEKEEPER registers are updated simultaneously. A halt will not interrupt an
update in progress. Updating will resume within a second after the bit is reset to a '0.'
3.2
Setting the clock
Bit D7 of the control register (7FF8h) is the WRITE bit. Setting the WRITE bit to a '1,' like the
READ bit, halts updates to the TIMEKEEPER registers. The user can then load them with
the correct day, date, and time data in 24-hour BCD format (see Table 5 on page 13).
Resetting the WRITE bit to a '0' then transfers the values of all time registers (7FF1h,
7FF9h-7FFFh) to the actual TIMEKEEPER counters and allows normal operation to
resume. After the WRITE bit is reset, the next clock update will occur in approximately one
second.
Note:
Upon power-up following a power failure, both the WRITE bit and the READ bit will be reset
to '0.'
3.3
Stopping and starting the oscillator
The oscillator may be stopped at any time. If the device is going to spend a significant
amount of time on the shelf, the oscillator can be turned off to minimize current drain on the
battery. The STOP bit is the MSB of the seconds register. Setting it to a '1' stops the
oscillator. When reset to a '0,' the M48T37Y/V oscillator starts within one second.
Note:
It is not necessary to set the WRITE bit when setting or resetting the FREQUENCY TEST
bit (FT) or the STOP bit (ST).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T37V-10MH6 | 功能描述:实时时钟 256K (32Kx8) 100ns 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 |
| M48T37V-10MH6E | 功能描述:实时时钟 256K (32Kx8) 100ns 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 |
| M48T37V-10MH6F | 功能描述:实时时钟 256K (32Kx8) 100ns 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 |
| M48T37V-10MH6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM |
| M48T37V-70MH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM |
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