Renesas R8C/17 Podręcznik Użytkownika Pobierz pdf (Strona 75)

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7.5 Pulse Period Measurement Mode:

This mode of operation is similar to the pulse width

measuring mode with a difference. In the pulse width

measurement, the counter takes all the input clocks

into account when the selected level of the input sig-

nal remains stable and available. With the pulse pe-

riod measurement mode, the timer counts down all the

input signals between either two rising or falling edges.

7.6 Pulse Output Mode:

When the timers are configured for this pulse output mode, the

underflow of the timing register changes the output level at the speci-

fied pins to generate the pulse of required duration.

Two output pins are assigned to these selected timers under the proper initializa-

tion. One output pin is controlled by the timing register and the other output pin

always indicates the inverted signal of the timer output.

The following figure indicates the operation of the pulse output mode format for

Timer X.

Apart from this timer, only Timer RA has this pulse output generating facility. The

Timer X has two pins to indicate timing outputs: CNTR0 and Complement output

of CNTR0. When the timer underflows, the polarity of the signal at the output

changes. During the underflow, both the prescalar and the timing registers are set

again with the contents of the reload registers and the counting keeps going. The

waveform at the timer output always has 50% duty cycle. During the configura-



With the pulse period mea-

surement mode

, the timer

counts down all the input

signals between either two

rising or falling edges.



 When the timers are

configured for the pulse output mode, the

underflow of the timing register changes

the output level at the specified pins

to generate the pulse of required

duration. The waveform at

the timer output always

has 50% duty

cycle.

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Renesas R8C/17 Podręcznik Użytkownika Strona 75