D12320VF25V Datasheet, PDF (593/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 15 D/A Converter
15.3 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
15.2 shows the timing of this operation.
[1] Write the conversion data to DADR0.
[2] Set the DAOE0 bit in DACR01 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
× V_ref
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.
Rev.7.00 Feb. 14, 2007 page 559 of 1108
REJ09B0089-0700