- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384875 > R2033K (Ricoh Co., Ltd.) 3 wire interface Real-Time Clock ICs PDF資料下載
參數(shù)資料
| 型號(hào)： | R2033K |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | 3 wire interface Real-Time Clock ICs |
| 中文描述： | 3線接口實(shí)時(shí)時(shí)鐘芯片 |
| 文件頁數(shù)： | 26/50頁 |
| 文件大?。?/td> | 542K |
| 代理商： | R2033K |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁當(dāng)前第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁
R2033K/T
Considerations in Reading and Writing Time Data under special condition
26
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 R2033K/T has 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
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| R2033K-E2 | 3 wire interface Real-Time Clock ICs |
| R2033T | 3 wire interface Real-Time Clock ICs |
| R2043T | 4-wire Serial Interface |
| R2043T-E2 | 4-wire Serial Interface |
| R2043K | 4-wire Serial Interface |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R2033K-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 |
| R2033T | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3 wire interface Real-Time Clock ICs |
| R2033T-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 |
| R203426000 | 功能描述:RF 連接器 SSMB(M) STR NA PCB RoHS:否 制造商:Bomar Interconnect 產(chǎn)品:Connectors 射頻系列:BNC 型式:Jack (Female) 極性: 觸點(diǎn)電鍍:Gold 阻抗: 端接類型:Solder 主體類型:Straight Bulkhead 電纜類型: |
| R203426000W | 功能描述:RF 連接器 EMB DR CI RoHS:否 制造商:Bomar Interconnect 產(chǎn)品:Connectors 射頻系列:BNC 型式:Jack (Female) 極性: 觸點(diǎn)電鍍:Gold 阻抗: 端接類型:Solder 主體類型:Straight Bulkhead 電纜類型: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。