TIMER A
7.5 One-shot pulse mode
counting.
Starts counting.
Stops counting.
Starts counting.
n
Reloaded
Reloaded
000116
Time
Set to “1” by software.
ꢀ Count start bit
ꢀ Trigger during counting
TAi IN pin
input signal
(1 / fi) ꢀꢀ(n)
(1 / fi) ꢀ (n + 1)
One-shot pulse
output from
TAi OUT pin
Timer Ai interrupt
request bit
fi
: Frequency of count source
n : Reload register’s contents
Cleared to “0” when interrupt request is accepted
or cleared by software.
ꢀ When the count start bit = “0” (counting stopped), the TAiOUT pin outputs “L” level.
ꢀ When a trigger is generated during counting, the counter counts the count source (n + 1) times after a new trigger is generated.
Note: The above applies when an external trigger (rising edge of TAiIN pin’s input signal) is selected.
Fig. 7.5.5 Example of operation in one-shot pulse mode (selecting external trigger)
7905 Group User’s Manual Rev.1.0
7-36
RENESAS [ RENESAS TECHNOLOGY CORP ]
