R2023K datasheet(50/50 Pages) RICOH

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R2023K/T

• Interrupt Process

(1) Periodic Interrupt

*2)

Other Interrupt

Processes

Set Periodic Interrupt

Cycle Selection Bits

CTFG=1?

Conduct

Periodic Interrupt

Yes

Control Register 2

←

(X1X1X011)

Generate Interrupt to CPU

*1)

(2) Alarm Interrupt

*3)

Other Interrupt

Processes

Set Alarm Min., Hr., and

Day-of-week Registers

WAFG or DAFG=1?

Conduct Alarm Interrupt

Yes

Control Register 2

←

(X1X1X101)

Generate Interrupt to CPU

*1)

WALE or DALE

←0

*2)

WALE or DALE

←1

*1) This step is intended to once disable the alarm

interrupt circuit by setting the WALE or DALE bits to

0 in anticipation of the coincidental occurrence of a

match between current time and preset alarm time in

the process of setting the alarm interrupt function.

*2) This step is intended to enable the alarm

interrupt function after completion of all alarm

interrupt settings.

*3) This step is intended to once cancel the alarm

interrupt function by writing the settings of "X,1,X,

1,X,1,0,1" and "X,1,X,1,X,1,1,0" to the Alarm_W

Registers and the Alarm_D Registers, respectively.

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

as a waveform mode for the periodic interrupt

function.

*2) 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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