- 您现在的位置：买卖IC网 > PDF目录80394 > M41T83ZM6F (STMICROELECTRONICS) 1 TIMER(S), REAL TIME CLOCK, PDSO8 PDF资料下载
参数资料
| 型号： | M41T83ZM6F |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封装： | 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8 |
| 文件页数： | 13/61页 |
| 文件大小： | 983K |
| 代理商： | M41T83ZM6F |
第1页第2页第3页第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页当前第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页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页
Clock operation
M41T82-M41T83
Doc ID 12578 Rev 12
3.1
Power-down time-stamp
When a power failure occurs, the time/date counters are copied into the buffer/transfer
registers and the halt update bit (HT) is automatically set to a "1". The HT bit prevents the
normal copying from counters to registers which occurs at the start of a read or write cycle.
Thus, upon power-up, the user can read the RTC registers to ascertain the time of power-
down. Additional reads will return the same time. It will appear to be frozen until the HT bit
(D6, address 0Ch) is written to 0 by the user. Then, subsequent reads will then return the
current time. For more information, see application notes AN1572 and AN3060.
Note:
Writes to the RTC registers (addresses 00h to 07h) with the HT bit set can cause time
corruption. Example: Assume a power-fail time of Monday, November 16, 2009, at
17:52:27.03. At the next power-up, that time will be frozen in the buffer/transfer registers.
On November 17, 2009, at 16:15:07.77, the user powers the system back up and tries to
write the seconds to 35 while the HT bit is still set. This will cause Monday, November 16,
2009, at 17:52:35.03 to be written into the counters because the other seven bytes of
buffer/transfer register still contain the time of power-down. The result is that the modified
time of power-down was written into the counters making it appear the part had lost time
while power was off. Thus, at power-up, the user should always clear the HT bit (write D6 to
0 in address 0Ch) before writing to any address in the range 00h to 07h.
A typical power-up flow is to read the time of power-down, then clear the HT bit, then read
the current time. If the time of power-down is not needed by the application, then the first
step can be omitted.
3.2
Clock/control register map and divider chain
The M41T8x is comprised of 32 addresses which contain registers for clock (time and date),
calibration (digital and analog), alarm 1 and 2, watchdog, flags, timer, and square wave
(M41T83 only). Clock and alarm registers store data in BCD format. Calibration, timer,
watchdog, and square wave bits are written in a binary format.
Whenever any of the eight RTC bytes (addresses 00h to 07h) are written, the internal divider
(or clock) chain will be reset upon the completion of the write cycle.
相关PDF资料 |
PDF描述 |
|---|---|
| MPC740PRX400RE | 32-BIT, 400 MHz, RISC PROCESSOR, CBGA255 |
| MPC8555EVTALF | 32-BIT, 667 MHz, RISC PROCESSOR, PBGA783 |
| MB88152APNF-G-110-JN-ERE1 | 16.6 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| MPC8547PXATGB | 32-BIT, 1200 MHz, MICROPROCESSOR, PBGA783 |
| MPC8547VTAQGB | 32-BIT, 1000 MHz, MICROPROCESSOR, PBGA783 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M41T83ZMY6E | 功能描述:实时时钟 Serial I2C bus RTC 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 |
| M41T83ZMY6F | 功能描述:实时时钟 Serial I2C bus RTC 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 |
| M41T83ZQ6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Serial RTC with battery switchover |
| M41T83ZQ6F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Serial RTC with battery switchover |
| M41T83ZQA6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Serial I2C bus RTC with battery switchover |
发布紧急采购，3分钟左右您将得到回复。