Renesas 7700 FAMILY User Manual page 119

TIMER A
5.5 One-shot pulse mode
[Precautions when operating in one-shot pulse mode]
1. If the count start bit is cleared to "0" during counting, the counter stops counting and the TAi
output level becomes "L." At the same time, the timer Ai interrupt request bit is set to "1."
2. A one-shot pulse is output synchronously with an internally generated count source. Accordingly, when
selecting an external trigger, there will be a delay equivalent to one cycle of count source at maximum
from when a trigger is input to the TAi
TAi pin's "H"
IN
input signal
"L"
Count
source
One-shot pulse
output from
TAi pin
OUT
Note: The above applies when an external trigger (falling of TAi
Fig. 5.5.6 Output delay in one-shot pulse output
3. When setting the timer's operating mode in one of the followings, the timer Ai interrupt request bit is set
to "1."
When the one-shot pulse mode is selected after a reset
When the operating mode is switched from the timer mode to the one-shot pulse mode
When the operating mode is switched from the event counter mode to the one-shot pulse mode
Therefore, when using the timer Ai interrupt (interrupt request bit), be sure to clear the timer Ai interrupt
request bit to "0" after above setting.
5–38
pin till when a one-shot pulse is output.
IN
Trigger input
Output delay
7751 Group User's Manual
Starts outputting of one-shot pulse
pin's input signal) is selected.
IN
pin's
OUT