HD6432351 datasheet(703/1025 Pages) RENESAS

703 / 1025 page

Section 16 D/A Converter

Rev. 3.00 Sep 15, 2006 page 669 of 988

REJ09B0330-0300

16.3

Operation

The D/A converter includes D/A conversion circuits for two channels, each of which can operate

independently.

D/A conversion is performed continuously while enabled by DACR. If either DADR0 or DADR1

is written to, the new data is immediately converted. The conversion result is output by setting the

corresponding DAOE0 or DAOE1 bit to 1.

The operation example described in this section concerns D/A conversion on channel 0. Figure

16.2 shows the timing of this operation.

[1] Write the conversion data to DADR0.

[2] Set the DAOE0 bit in DACR to 1. D/A conversion is started and the DA0 pin becomes an

output pin. The conversion result is output after the conversion time has elapsed. The output

value is expressed by the following formula:

DADR contents

256

× Vref

The conversion results are output continuously until DADR0 is written to again or the DAOE0

bit is cleared to 0.

[3] If DADR0 is written to again, the new data is immediately converted. The new conversion

result is output after the conversion time has elapsed.

[4] If the DAOE0 bit is cleared to 0, the DA0 pin becomes an input pin.

HD6432351 Datasheet(PDF) 703 Page - Renesas Technology Corp