- 您现在的位置：买卖IC网 > PDF目录80359 > M48T02-200PC1 (STMICROELECTRONICS) 0 TIMER(S), REAL TIME CLOCK, PDIP24 PDF资料下载
参数资料
| 型号： | M48T02-200PC1 |
| 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, PDIP24 |
| 封装： | 0.600 INCH, ROHS COMPLIANT, PLASTIC, DIP-24 |
| 文件页数： | 4/25页 |
| 文件大小： | 199K |
| 代理商： | M48T02-200PC1 |
Clock operations
M48T02, M48T12
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, the seventh bit in the control
register. 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
The eighth bit of the control register 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 (on Table5 on page13).
Resetting the WRITE bit to a '0' then transfers the values of all time registers (7F9-7FF) to
the actual TIMEKEEPER counters and allows normal operation to resume. The FT bit and
the bits marked as '0' in Table 5 on page 13 must be written to '0' to allow for normal
TIMEKEEPER and RAM operation.
See the application note AN923, “TIMEKEEPER rolling into the 21st century” for
information on century rollover.
相关PDF资料 |
PDF描述 |
|---|---|
| M48T35Y-70PC1 | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| M48T559YMH1TR | 0 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M37212M6-XXXSP | 8-BIT, MROM, MICROCONTROLLER, PDIP52 |
| M38223M4-XXXHP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP80 |
| M38044M4-XXXSP | 8-BIT, MROM, 16.8 MHz, MICROCONTROLLER, PDIP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T02-200PC1 | 制造商:STMicroelectronics 功能描述:IC SRAM TIMEKEEPER 16K |
| M48T02-200PC1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0V, 16 Kbit (2Kb x 8) TIMEKEEPER㈢ SRAM |
| M48T02-70PC1 | 功能描述:实时时钟 16K (2Kx8) 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 |
| M48T02-70PC1 | 制造商:STMicroelectronics 功能描述:IC NVRAM 10 YR BATTERY 16K 48T02 |
| M48T02-70PC1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0V, 16 Kbit (2Kb x 8) TIMEKEEPER㈢ SRAM |
发布紧急采购，3分钟左右您将得到回复。