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參數(shù)資料
| 型號： | RX-4045NBAA |
| 元件分類： | XO, clock |
| 英文描述： | REAL TIME CLOCK, PDSO22 |
| 封裝： | ROHS COMPLIANT, SON-22 |
| 文件頁數(shù)： | 25/37頁 |
| 文件大小： | 554K |
| 代理商： | RX-4045NBAA |
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RX - 4045 SA / NB
Page - 28
MQ442-01
8.9.4. Caution points on read/write of time data
If the time value is changed across several digits during a time read/write operation, an incorrect time value may
be read or written.
For example, if a read operation is started when the time value is 13:59:59 and the timer's value changes from
13:59:59 to 14:00:00 while the time value is being read (sequentially from seconds to minutes to hours), the read
values for "seconds" and "minutes" may be each "59" while the read value for "hours" may be "14", resulting in a
read time value of 14:59:59, which is off by one hour. Similar errors can occur when writing time values.
The RX-4045 prevents these types of read/write errors by setting the time value incrementation function on hold
while the CE pin is at high level (the hold is canceled and incrementation resumes when the CE pin returns to low
level).
Since the hold function operates only for one second, the CE pin must return to low level within one second.
CE
Time in RTC
14:00:01
Actual time
13:59:59
Max. 39
s
14:00:00
13:59:59
14:00:00
14:00:01
Note the following caution points when using this function while reading or writing time values.
(1) Keep the CE pin at high level while reading or writing one time value.
(2) The period during which CE = H should not exceed one second. Due to the remote possibility that the host
system may go down while reading or writing a time value, a peripheral circuit should be implemented to set CE
as either low or open as soon as such an event occurs.
(3) After CE has been switched from low to high, leave a time interval of at least 31 s before accessing any
address from 0h to 6h. (This allows time for completion of any incrementation of two digits or more in the time
value that the RX-4045 might be performing.)
(4) After CE has been switched from high to low, leave a time interval of at least 61
s before CE is switched high
again. (This allows the RX-4045 to correct the time value if the value was due to change while CE = H.)
(5) The above caution points do not have to be considered as long as time read/write operations are clearly set so
as to avoid time value incrementation of two or more digits (such as by timing the read/write operation to
coincide with level-mode periodic interrupts or alarm interrupts.)
* Correct and incorrect examples of time read/write operations are illustrated on the next page.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| RX-4045SA-0 | REAL TIME CLOCK, PDSO14 |
| RX-4045SA-3 | REAL TIME CLOCK, PDSO14 |
| RX-4801JE | REAL TIME CLOCK, PDSO20 |
| RX5C348A | 4-WIRE SERIAL INTERFACE |
| RYC8240-4WM | SWITCHED CAPACITOR REGULATOR, PDSO16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RX-4045SA | 制造商:EPSON 制造商全稱:EPSON 功能描述:4-wire serial interface high-stability RTC module |
| RX-4045SA,(AA) | 制造商:Epson Toyocom 功能描述:Serial Interface RTC SOP 14pin |
| RX-4045SAAA | 制造商:Epson Toyocom Corporation 功能描述:Cut Tape 制造商:Epson Toyocom Corporation 功能描述:RTC HI STABILITY SERIAL SMD SOP14 制造商:Epson Toyocom Corporation 功能描述:RTC HI STABILITY SERIAL, SMD, SOP14 制造商:Epson Toyocom Corporation 功能描述:RTC HI STABILITY SERIAL, SMD, SOP14; Date Format:YYYY:MM:DD:Hr:Min:Secs; Clock Format:12Hr / 24Hr; Clock IC Type:RTC; Supply Voltage Min:1.7V; Supply Voltage Max:5.5V; Digital IC Case Style:SOP; No. of Pins:14; Interface Type:Serial;;RoHS Compliant: Yes |
| RX-409 | 功能描述:烙鐵 SOLDERING TIP RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included |
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