RS5C348A(2003) Ver la hoja de datos (PDF) - RICOH Co.,Ltd.

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RS5C348A
(Rev.:2003)

4-wire Serial Interface

RICOH Co.,Ltd. 

Reading Time and Calendar Data

(1) Ordinary Process of Reading Time and Calendar Data

Rx5C348A/B

*1)

CE ← H

Read from Time Counter

and Calendar Counter

CE ← L

*2)

*1) When writing to clock and calendar counters, do not insert Stop Condition

until all times from second to year have been written to prevent error in

writing time. (Detailed "P.24 Considerations in Reading and Writing

Time Data under special condition".

*2) Take care so that process from Start Condition to Stop Condition will be

complete within 0.5sec. (Detailed in "P.24 Considerations in

Reading and Writing Time Data under special condition".

(2) Basic Process of Reading Time and Calendar Data with Periodic Interrupt Function

Set Periodic Interrupt *1)

Cycle Selection Bits

*1) This step is intended to select the level mode as a

waveform mode for the periodic interrupt function.

*2) This step must be completed within 1.0 second.

*3) This step is intended to set the CTFG bit to 0 in the

Control Register 2 to cancel an interrupt to the CPU.

Generate Interrupt in CPU

No

CTFG=1?

Yes

*2)

Read from Time Counter

and Calendar Counter

*3)

Control Register 2

←(X1X1X011)

Other Interrupt

Processes

Rev.2.01

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