参数资料
型号: RTC6581
元件分类: 时钟/数据恢复及定时提取
英文描述: REAL TIME CLOCK, PDIP24
封装: DIP-24
文件页数: 22/35页
文件大小: 591K
代理商: RTC6581
EPSON
EPSON ELECTRONICS AMERICA, INC.
RTC-658X/RTC-659X
3. Reading the Time and Calendar (RTC pin = "L")
Method 1
*If UIP is read and returns “0”, then no update will occur for at least 244
s.
Method 2
*IRQ is due to either a periodic interrupt or an update ended interrupt.
4. VRT bit
The VRT bit provides a check function to determine if the back-up power supply was maintained. (RTC register D)
After the VDD power on, the first value read reflects the state of the VBAT voltage during the back-up interval.
The second and subsequent values read reflect the VBAT state at the time of VDD power on. Only the first value read,
therefore, can be used as a back-up check to determine the integrity of the chip data.
Value of register D
UIP=1
Read the time and
Calendar
N
Y
IRQ generated?
Read the time and
Calendar
Y
N
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