7721 datasheet(163/577 Pages) RENESAS

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TIMER A

7721 Group User’s Manual

8–44

8.6 Pulse width modulation (PWM) mode

Fig. 8.6.4 Operation example of 16-bit pulse width modulator

Fig. 8.6.5 Operation example of 16-bit pulse width modulator (when counter value is updated during

pulse output)

1 / fi ! (216 – 1)

1 / fi ! (n)

Count source

TAjIN pin’s input signal

PWM pulse output

from TAjOUT pin

Note: The above applies when reload register (n) = “000316” and an external trigger (rising edge of

TAjIN pin’s input signal) is selected.

Trigger is not generated by this signal.

Timer Aj interrupt

request bit

Cleared to “0” when interrupt request is accepted

or cleared by software.

fi: Frequency of count source

(f2, f16, f64, or f512)

When an arbitrary value is set to the timer Aj register after setting “000016” to it, the timing at which the PWM pulse goes “H”

depends on the timing at which the new value is set.

Note: The above applies when an external trigger (rising edge of TAjIN pin’s input signal) is selected.

FFFE16

000116

TAjIN pin’s

input signal

(1 / fi) ! (216 –1)

(216 –1) – n

(1 / fi) ! (216 –1)

PWM pulse

output from

TAjOUT pin

“000016” is set to timer Aj

“200016” is set to timer Aj

200016

“FFFE16” is set to timer Aj

n = Reload register’s contents

fi: Frequency of count source

(f2, f16, f64, or f512)

Restarts counting.

Stops

counting.

Time

(1 / fi) ! (2 –1)

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