Renesas 7700 FAMILY User Manual page 118

n = Reload register's contents
FFFF
16
n
0001
16
Set to "1" by software.
"1"
Count start bit
"0"
"H"
TAi pin
IN
input signal
"L"
One-shot pulse "H"
output from
"L"
TAi pin
OUT
Timer Ai interrupt "1"
request bit
"0"
fi = Frequency of count source
(f /f , f /f , f
2 4 16 32
When the count start bit = "0" (counting stopped), the TAi
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 of TAi
Fig. 5.5.5 Example of operation in one-shot pulse mode (selecting external trigger)
Starts counting.
Reloaded
1 / f (n)
i
/f , or f /f ) Cleared to "0" when interrupt request is accepted
64 128 512 1024
or cleared by software.
7751 Group User's Manual
Stops
counting.
Starts counting.
Trigger during counting
pin outputs "L" level.
OUT
pin's input signal) is selected.
IN
TIMER A
5.5 One-shot pulse mode
Stops counting.
Reloaded
1 / f (n+1)
i
Time
5–37