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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 DA
0
becomes an output pin. The
converted result is output after the conversion time.
×
V
REF
The output value is
DADR contents
256
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
Address
DADR0
DAOE0
DA
φ
0
Conversion data 1
Conversion data 2
High-impedance state
Conversion
result 1
Conversion
result 2
t
DCONV
t
DCONV
Legend:
t : D/A conversion time
DCONV
Figure 15.2 Example of D/A Converter Operation
Содержание H8/3008
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