參數(shù)資料
型號(hào)： R2023T
廠商： Ricoh Co., Ltd.
英文描述： 2-wire Serial Interface Real Time Clock IC
中文描述： 2線串行接口實(shí)時(shí)時(shí)鐘芯片
文件頁(yè)數(shù)： 28/50頁(yè)
文件大?。?/td> 512K
代理商： R2023T
R2023K/T
Data Transmission under Special Condition
28
The R2023K/T holds the clock tentatively for duration from Start Condition to avoid invalid read or write clock on
carrying clock. When clock carried during this period, which will be adjusted within approx. 61
μ
s from Stop
Condition. To prevent invalid read or write, clock and calendar data shall be made during one transmission
operation (from Start Condition to Stop Condition). When 0.5 to 1.0 second elapses after Start Condition, any
access to the R2023K/T is automatically released to release tentative hold of the clock, and access from the CPU
is forced to be terminated (The same action as made Stop Condition is received: automatic resume function from
I
2
C-Bus interface). Therefore, one access must be complete within 0.5 seconds. The automatic resume function
prevents delay in clock even if SCL is stopped from sudden failure of the system during clock read operation.
Also a second Start Condition after the first Start Condition and before the Stop Condition is regarded “Repeated
Start Condition”. Therefore, when 0.5 to 1.0 seconds passed after the first Start Condition, an access to the
R2023K/T is automatically released.
If access is tried after automatic resume function is activated, no acknowledge signal will be output for writing while
FFh will be output for reading.
The user shall always be able to access the real-time clock as long as three conditions are met.
No Stop Condition shall be generated until clock and calendar data read/write is started and completed.
One cycle read/write operation shall be complete within 0.5 seconds.
Do not make Start Condition within 61
μ
s from Stop Condition. When clock is carried during the access, which will
be adjusted within approx. 61
μ
s from Stop Condition.
Bad example of reading from seconds to hours (invalid read)
(Start Condition)
→
(Read of seconds)
→
(Read of minutes)
→
(Stop Condition)
→
(Start Condition)
→
(Read of
hour)
→
(Stop Condition)
Assuming read was started at 05:59:59 P.M. and while reading seconds and minutes the time advanced to
06:00:00 P.M. At this time second digit is hold so read the read as 05:59:59. Then the R2023K/T confirms (Stop
Condition) and carries second digit being hold and the time change to 06:00:00 P.M. Then, when the hour digit is
read, it changes to 6. The wrong results of 06:59:59 will be read.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
R2023T-E2 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:2-wire Serial Interface Real Time Clock IC
R2-0257-02 制造商:Southco 功能描述:
R2-0259-02 制造商:Southco 功能描述:
R2025D 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:High precision I2C-Bus Real-Time Clock Module
R2025S 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:High precision I2C-Bus Real-Time Clock Module
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