Renesas 7700 FAMILY User Manual page 126

Count source
TAi pin's input signal
IN
PWM pulse output
from TAi pin
OUT
Timer Ai interrupt
request bit
fi: Frequency of count source
(f /f , f
2 4
Note: The above applies when reload register (n) = "0003
pin's input signal) is selected.
Fig. 5.6.4 Operation example of 16-bit pulse width modulator
n = Reload register's contents
FFFE
16
2000
16
16
(2 –1) – n
n
0001
16
TAi pin's "H"
IN
input signal
"L"
PWM pulse
"H"
output from
TAi pin "L"
OUT
fi: Frequency of count source
(f /f , f /f , f /f , or f
2 4 16 32 64 128
When an arbitrary value is set to the timer Ai register after setting "0000
depends on the timing at which the new value is set.
Note: The above applies when an external trigger (rising of TAi
Fig. 5.6.5 Operation example of 16-bit pulse width modulator (when counter value is updated during
pulse output)
"H"
"L"
"H"
"L"
"1"
"0"
/f , f /f , or f /f )
16 32 64 128 512 1024
16
(1 / f ) (2 –1)
i
"FFFE " is set to timer Ai
16
register.
/f )
512 1024
7751 Group User's Manual
5.6 Pulse width modulation (PWM) mode
1 / f (2 – 1)
16
i
Trigger is not generated by this signal.
1 / f (n)
i
Cleared to "0" when interrupt request is accepted
or cleared by software.
" and an external trigger (rising of TAi
16
16
(1 / f ) (2 –1)
i
counting.
"0000 " is set to timer Ai
16
register.
" to it, the timing at which the PWM pulse goes "H"
16
pin's input signal) is selected.
IN
TIMER A
IN
16
(1 / Pf ) (2 –1)
i
Stops
Restarts counting.
"2000 " is set to timer Ai
16
register.
Time
5–45