Casio MR-G 5068 - Countdown Timer

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Countdown Timer
The Countdown Timer lets you set a start time of up to 24 hours ••
in 1-minute steps, and then countdown from there in one-second
steps.
The watch beeps for 10 seconds when the end of the countdown ••
is reached.
When the end of the countdown is reached, the watch switches ••
automatically to measurement of the time elapsed since the end of
the countdown (in units of one second).
When the maximum limit (24 hours) of the elapsed time ••
measurement operation is reached, the elapsed time operation
continues from zero.

v3TART
v3TOP
v4IMERSTARTTIME
nMINUTE
#OUNTDOWNTIMERSECONDHAND
)NDICATESTO42
v4IMERSTARTTIME
MINUTE
v2ESET
#OUNTDOWN4IMERHOURSANDMINUTES