7733 datasheet(159/940 Pages) RENESAS

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TIMER A

7733 Group User’s Manual

6–48

6.6 Pulse width modulation (PWM) mode

Fig. 6.6.4 Operation example of 16-bit pulse width modulator

Fig. 6.6.5 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

Pin TAiIN’s input signal

PWM pulse output

from pin TAiOUT

g The above is applied when the reload register = 000316 and an external trigger (Rising edge of pin

TAiIN’s input signal) is selected.

Trigger is not generated by this signal.

“H”

“L”

Timer Ai interrupt

request bit

“1”

“0”

Cleared to “0” when an interrupt request is accepted;

otherwise, cleared by software

fi: Frequency of the count source

(f2, f16, f64, or f512)

PWM pulse

output from

pin TAiOUT

When an arbitrary value is reset to the timer Ai register after value “000016” is set to it, the rising timing of PWM

pulse depends on this reset timing.

g The above is applied when an external trigger (Rising edge of pin TAiIN’s input signal) is selected.

FFFE16

000116

Pin TAiIN’s

input signal

“H”

“L”

“H”

“L”

(1 / fi) ! (216 – 1)

(216 – 1) – n

(1 / fi) ! (216 – 1)

Value “000016” is set to

the timer Ai register.

Value “200016” is set to

the timer Ai register.

200016

Value “FFFE16” is set to

the timer Ai register.

n = Reload register’s contents

fi: Frequency of the count source

(f2, f16, f64, or f512)

Counting is

restarted.

Counting is

stopped.

Time

(1 / fi) ! (216 – 1)

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