D12320VF25IV Datasheet, PDF (761/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 D/A Converter
[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 _{× Vref}
256
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.
DADR0
write cycle
DACR01
write cycle
DADR0
write cycle
DACR01
write cycle
φ
Address
DADR0
DAOE0
Conversion data 1
Conversion data 2
DA0
High-impedance state
t_DCONV
Conversion
result 1
Conversion
result 2
t_DCONV
Legend:
t_DCONV: D/A conversion time
Figure 17.2 Example of D/A Converter Operation
Rev.6.00 Sep. 27, 2007 Page 729 of 1268
REJ09B0220-0600