R2023K datasheet(49/50 Pages) RICOH

Il numero della parte	R2023K

Spiegazioni elettronici	2-wire Serial Interface Real Time Clock IC

PDF	50 Pages

Scroll/Zoom	100%

Produttore elettronici	RICOH [RICOH electronics devices division]

Homepage	http://www.ricoh.com

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R2023K/T

(3) Applied Process of Reading Time and Calendar Data with Periodic Interrupt Function

Time data need not be read from all the time counters when used for such ordinary purposes as time count

indication.

This applied process can be used to read time and calendar data with substantial reductions in the

load involved in such reading.

For Time Indication in "Day-of-Month, Day-of-week, Hour, Minute, and Second"

Format:

*2)

Other interrupts

Processes

Sec.=00?

Yes

Generate interrupt to CPU

*1)

*3)

CTFG=1?

Control Register 2

←

(X1X1X011)

Yes

Read Min.,Hr.,Day,

and Day-of-week

*4)

Control Register 1

←

(XXXX0100)

Control Register 2

←

(X1X1X011)

Use previous Min.,Hr.,

Day, and Day-of-week data

*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 0.5 sec.

*3) This step is intended to read time

data from all the time counters only in

the first session of reading time data

after writing time data.

*4) This step is intended to set the

CTFG bit to 0 in the Control Register

2 to cancel an interrupt to the CPU.

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