UPD17708 datasheet(204/356 Pages) NEC

No. de pieza	UPD17708

Descripción Electrónicos	4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM

PDF	356 Pages

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Fabricante Electrónico	NEC [NEC]

Página de inicio	http://www.nec.com/

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204

µPD17704, 17705, 17707, 17708, 17709

15.3 PWM Output Selection Block

The output selection block specifies whether each output pin of the D/A converter is used for the D/A converter

or as a general-purpose output port, by using the PWM2SEL through PWM0SEL flags of the PWM/general-purpose

port pin function selection register.

Figure 15-3 shows the configuration of the output selection block, and Figure 15-4 shows the configuration of the

PWM/general-purpose port pin function selection register.

Each pin can be changed between the D/A converter mode and general-purpose output port mode independently

of the others.

Because each output pin is an N-ch open-drain output pin, an external pull-up resistor is necessary.

When the D/A converter is used as timer 3, the P1B2/PWM2 through P1B0/PWM0 pins are automatically set in

the general-purpose output port mode, regardless of the values set to the PWM2SEL through PWM0SEL flags.

Figure 15-3. Configuration of Output Selection Block

PWM2SEL through PWM0SEL flags

TM3SEL

Comparator output

Output latch

Each output pin

UPD17708 Datasheet(PDF) 204 Page - NEC