M38043FDHKP datasheet(245/387 Pages) RENESAS

245 / 387 page

2-121

APPLICATION

2.6 PWM

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

Fig. 2.6.7 Setting of relevant registers

1. Set the PWM function enable bit to “1” : The P56/PWM pin is used as the PWM pin.

The pulse beginning with “H” level pulse is output.

2. Set the PWM function enable bit to “0” : The P56/PWM pin is used as the port P56.

Thus, when fixing the output level, take the following procedure:

(1) Write an output value to bit 6 of the port P5 register.

(2) Write “010000002” to the port P5 direction register.

3. After data is set to the PWM prescaler and the PWM register, the PWM waveforms corresponding to updated

data will be output from the next repetitive cycle.

Fig. 2.6.8 PWM output

PWM output: Enabled (Note)

PWMCON

PWM control register (Address : 002B16)

255 ✕ (n + 1)

Set “T”, PWM cycle

n = 1

PREPWM

PWM prescaler (Address : 002C16)

Note: The PWM output function has priority even when bit 6 (corresponding bit to P56 pin)

of Port P5 direction register is set to “0” (input mode).

Count source: f(XIN)

[Equation]

T =

Set “t”, “H” level width of PWM

m = 100

PWM

PWM register (Address : 002D16)

[Equation]

t =

f(XIN)

T ✕ m

255

PWM output

Change PWM

output data

From the next repetitive cycle,

output modified data

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