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參數(shù)資料
| 型號： | R2061K |
| 英文描述： | real-time clock ICs |
| 中文描述： | 實(shí)時時鐘IC |
| 文件頁數(shù)： | 24/48頁 |
| 文件大?。?/td> | 322K |
| 代理商： | R2061K |
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R2061 Series
G
Considerations in Reading and Writing Time Data under special condition
Any carry to the second digits in the process of reading or writing time data may cause reading or writing erroneous
time data. For example, suppose a carry out of 13:59:59 into 14:00:00 occurs in the process of reading time data
in the middle of shifting from the minute digits to the hour digits. At this moment, the second digits, the minute
digits, and the hour digits read 59 seconds, 59 minutes, and 14 hours, respectively (indicating 14:59:59) to cause
the reading of time data deviating from actual time virtually 1 hour. A similar error also occurs in writing time data.
To prevent such errors in reading and writing time data, the RV5C338A have the function of temporarily locking any
carry to the second digits during the high interval of the CE pin and unlocking such a carry in its high to low
transition. Note that a carry to the second digits can be locked for only 1 second, during which time the CE pin
should be driven low.
Actual time
12345
Rev.1.00 - 24 -
CE
Time counts
within RTC
14:00:01
13:59:59
Max.62
μ
s
14:00:00
13:59:59
14:00:00
14:00:01
The effective use of this function requires the following considerations in reading and writing time data:
(1) Hold the CE pin high in each session of reading or writing time data.
(2) Ensure that the high interval of the CE pin lasts within 1 second. Should there be any possibility of the host
going down in the process of reading or writing time data, make arrangements in the peripheral circuitry as to drive
the CE pin low or open at the moment that the host actually goes down.
(3) Leave a time span of 31
μ
s or more from the low to high transition of the CE pin to the start of access to
addresses 0h to 6h in order that any ongoing carry of the time digits may be completed within this time span.
(4) Leave a time span of 62
μ
s or more from the high to low transition of the CE pin to its low to high transition in
order that any ongoing carry of the time digits during the high interval of the CE pin may be adjusted within this time
span.
The considerations listed in (1), (3), and (4) above are not required when the process of reading or writing time data
is obviously free from any carry of the time digits.
(e.g. reading or writing time data in synchronization with the periodic interrupt function in the level mode or the alarm
interrupt function).
Good and bad examples of reading and writing time data are illustrated on the next page.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R2061K01-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2061K03-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2061S02-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2062 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2062K01-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
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