HD6413008VF25 Datasheet, PDF (487/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

15. D/A Converter
An example of D/A conversion on channel 0 is given next. Timing is indicated in figure 15.2.
1. Data to be converted is written in DADR0.
2. Bit DAOE0 is set to 1 in DACR. D/A conversion starts and DA₀ becomes an output pin. The
converted result is output after the conversion time.
The output value is
DADR contents
256
× V_REF
Output of this conversion result continues until the value in DADR0 is modified or the
DAOE0 bit is cleared to 0.
3. If the DADR0 value is modified, conversion starts immediately, and the result is output after
the conversion time.
4. When the DAOE0 bit is cleared to 0, DA0 becomes an input pin.
DADR0
write cycle
DACR
write cycle
DADR0
write cycle
DACR
write cycle
φ
Address
DADR0
Conversion data 1
Conversion data 2
DAOE0
DA ₀
High-impedance state
Conversion
result 1
Conversion
result 2
Legend:
t _DCONV : D/A conversion time
t _DCONV
t _DCONV
Figure 15.2 Example of D/A Converter Operation
Rev.4.00 Aug. 20, 2007 Page 441 of 638
REJ09B0395-0400