UPD17062 datasheet(219/298 Pages) RENESAS

219 / 298 page

217

µPD17062

Peripheral equipment

Peripheral address

Corresponding pin

PWM0

05H

PWM0

PWM1

06H

PWM1

PWM2

07H

PWM2

PWM3

08H

PWM3

17. D/A CONVERTER

17.1

PWM PINS

The

µPD17062 has 4 output pins for 6-bit PWM, which enables varying the duty cycle of the 15.625 kHz pulse

signal in 64 steps. With this capability, attaching an external lowpass filter to the

µPD17062 makes it function

as a D/A converter. The PWM pins can also be used as 1-bit output ports.

When used as a D/A converter, the

µPD17062 sets the D/A outputs in the output data latches, PWMRs. These

latches, PWMR0, PWMR1, PWMR2, and PWMR3, are mapped at addresses 05H, 06H, 07H, and 08H, respec-

tively. They can be read- and write-accessed via the DBF. Table 17-1 lists the correspondence between the

PWMR addresses and the PWM pins.

Table 17-1

PWMR Addresses and the Corresponding Pins

Each PWMR consists of 7 bits. Fig. 17-1 shows the configuration of the PWMR and its correspondence with

the DBF. The highest bit of the PWMR specifies whether the PWM pin is to be used as a PWM output pin or

an output port. The other six bits specify the output values of the PWM signal.

Fig. 17-2 shows the waveform output from the PWMR pin.

UPD17062 데이터시트(PDF) 219 Page - Renesas Technology Corp