M38203M4 Datasheet, PDF (133/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.3 Timer X and timer Y
Count period
Count period T(s) = 1 ÷ count source frequency ! (the Y counter initial value + 1)
Event counter mode operation example
•UF : Underflow
•RL : Reload
•n : The Y counter initial value
Timer Y stop
control bit
Count source
(P55/CNTR1 pin)
RL
RL
n16
Writing “1” Writing “0”
RL
RL Count stop
Count restart
UF
UF
UF
UF
000016
T
CNTR1 active
edge switch bit _{CNTR0 interrupt request occurs at falling edge of the count source}
CNTR1 interrupt
request bit
CNTR1 interrupt
enable bit
1
1
1
1
Time
1
Timer Y interrupt
request bit
1
1
1
1
Timer Y interrupt
enable bit
1 : •Clearing by writing “0” to the timer Y interrupt request bit or the CNTR1 interrupt request bit.
•Clearing by accepting the timer Y interrupt request and the CNTR1 interrupt request when the
respective interrupt enable bits are “1.”
V : When the CNTR1 active edge switch bit is “1” ;
•Falling edge of the count source is valid.
•The CNTR1 interrupt request occurs at the rising edge of the output pulse.
Fig. 2.3.8 Event counter mode operation example
3820 GROUP USER’S MANUAL
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