M38047F9HKP datasheet(246/387 Pages) RENESAS

246 / 387 page

2-122

APPLICATION

2.6 PWM

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

By setting the related registers as shown by Figure 2.6.7, PWM waveforms are output to the externals.

This PWM output is integrated through the low pass filter, and that converted into DC signals is used

for control of the motor. Figure 2.6.9 shows control procedure.

Fig. 2.6.9 Control procedure

2.6.4 Notes on PWM

The PWM starts after the PWM enable bit is set to enable and “L” level is output from the PWM pin.

The length of this “L“ level output is as follows:

(s)

(Count source selection bit = 0, where n is the value set in the prescaler)

(s)

(Count source selection bit = 1, where n is the value set in the prescaler)

n + 1

2 • f(XIN)

n + 1

f(XIN)

(Address : 000A16), bit6

P5D (Address : 000B16)

PREPWM (Address : 002C16)

PWM

(Address : 002D16)

PWMCON (Address : 002B16)

• “L” level output from P56/PWM pin

X1XXXXXX2

100

XXXXXX012

• PWM period setting

• “H” level width of PWM setting

• PWM count source selected, PWM output enabled

• X : This bit is not used here.

Set it to “0” or “1” arbitrarily.

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