R8A66170SP データシートの表示（PDF） - Renesas Electronics

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R8A66170SP

4-CH 16-BIT PWM GENERATOR

Renesas Electronics 

R8A66170DD/SP

(2) Mode1

This mode is selected by setting D4 = 0 and D3 = 1 in command 1. Figure 10 shows the block diagram in this mode (for

one channel).

This mode outputs the pulse which is determined by value M of PWM register as one shot by trigger signal.

The type of this output operation is determined by whether the external trigger signal or the internal trigger signal is

used. Operation varies according to the choice of external and internal trigger signals.

(a) External trigger selected (D1 = 1 in command 1)

This mode outputs, when a trigger pulse is applied to trigger input TRG, one shot of output pulse. Therefore, cycle time

T becomes cycle time fIN of the trigger pulse to be applied to trigger input TRG.

The output pulse width is determined by the prescaler register value L and PWM register value M. (See Fig.5)

1

f (XIN)

Oscillator source

1

f IN

TRG trigger input

Internal signal

Prescaler output

(PWM clock)

(at L = 1)

PWM output

M=0

"L"

M=1

M=2

M=3

・

・

・

L+1

f (XIN)

f

L+1

(XIN)

・M

T= 1

f IN

T :Cycle time (μs)

f(XIN) :Oscillator frequency (MHz)

L :Prescaler set value

M :Ｈ width set value

fIN :Trigger input frequency (MHz)

Fig.5 (When H width polarity is “H”)

REJ03F0272-0100 Rev.1.00 Apr.01.2008

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