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M38203M4 Datasheet, PDF (123/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER | |||
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APPLICATION
2.3 Timer X and timer Y
Count period
Count period T(s) = 1 ÷ count source frequency ! (the X counter initial value + 1)
Event counter mode operation example
â¢UF : Underflow
â¢RL : Reload
â¢n : The X counter initial value
Timer X stop
control bit
Count source
(P54/CNTR0 pin)
Writing â1â Writing â0â
RL
RL
RL
RL Count stop
n16
Count restart
UF
UF
UF
UF
000016
T
CNTR0 active
edge switch bit CNTR0 interrupt request occurs at falling edge of the count source
CNTR0 interrupt
request bit
CNTR0 interrupt
enable bit
1
1
1
1
Time
1
Timer X interrupt
request bit
1
1
1
1
Timer X interrupt
enable bit
1 : â¢Clearing by writing â0â to the timer X interrupt request bit or the CNTR0 interrupt request bit.
â¢Clearing by accepting the timer X interrupt request and the CNTR0 interrupt request when the
respective interrupt enable bits are â1.â
V : When the CNTR0 active edge switch bit is â1â ;
â¢Falling edge of the count source is valid.
â¢The CNTR0 interrupt request occurs at the rising edge of the output pulse.
Fig. 2.3.3 Event counter mode operation example
3820 GROUP USERâS MANUAL
2â37
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