r8a66170dd Renesas Electronics Corporation., r8a66170dd Datasheet - Page 7

• Manufacturer Part Number: r8a66170dd
• Description: 4-ch 16-bit Pwm Generator
• Manufacturer: Renesas Electronics Corporation.

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 f
The output pulse width is determined by the prescaler register value L and PWM register value M. (See Fig.5)
Fig.5 (When H width polarity is “H”)
REJ03F0272-0100 Rev.1.00 Apr.01.2008
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Internal signal
PWM output
Prescaler output
(PWM clock)
(at L = 1)
TRG trigger input
Oscillator source
IN
of the trigger pulse to be applied to trigger input TRG.
M=0
M=1
M=2
M=3
・
・
・
"L"
f (X
1
IN
)
f (X
f (X
L+1
L+1
IN
IN
)
)
・M
T
f(X
L
M
f
IN
f
1
IN
IN
) :Oscillator frequency (MHz)
:
:Prescaler set value
:
Cycle time (μs)
Ｈ width set value
:Trigger input frequency (MHz)
T=
f
1
IN