- 您现在的位置：买卖IC网 > PDF目录80565 > M48T59Y-70MH1F (STMICROELECTRONICS) 0 TIMER(S), REAL TIME CLOCK, PDSO28 PDF资料下载
参数资料
| 型号： | M48T59Y-70MH1F |
| 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, PDSO28 |
| 封装： | 0.330 INCH, LEAD FREE, PLASTIC, SOH-28 |
| 文件页数： | 4/32页 |
| 文件大小： | 373K |
| 代理商： | M48T59Y-70MH1F |
第1页第2页第3页当前第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
Clock operations
M48T59, M48T59Y, M48T59V
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 (1FF8h).
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 is within a second after the bit is reset to a '0.'
3.2
Setting the clock
Bit D7 of the Control register (1FF8h) 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 (1FF9h-
1FFFh) to the actual TIMEKEEPER counters and allows normal operation to resume. After
the WRITE Bit is reset, the next clock update will occur within approximately one second.
See the Application Note AN923, “TIMEKEEPER Rolling Into the 21st Century” for
information on Century Rollover.
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. The M48T59/Y/V in the DIP package is shipped from STMicroelectronics with the
STOP Bit set to a '1.' When reset to a '0,' the M48T59/Y/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), the STOP Bit (ST) or the CENTURY ENABLE Bit (CEB).
相关PDF资料 |
PDF描述 |
|---|---|
| M926-02I622.0800 | 622.08 MHz, OTHER CLOCK GENERATOR, CQCC36 |
| MC9S08RD32CFJ | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| MC9S08RD8CFJ | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| MB90342ASPFV | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP100 |
| MB90F343ASPFV | 16-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP100 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T59Y-70MH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| M48T59Y-70MH6 | 功能描述:实时时钟 R 511-M48T59Y-70MH6E 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 |
| M48T59Y-70MH6E | 功能描述:实时时钟 64K (8Kx8) 70ns 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 |
| M48T59Y-70MH6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM |
| M48T59Y-70PC1 | 功能描述:实时时钟 64K (8Kx8) 70ns 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 |
发布紧急采购，3分钟左右您将得到回复。