Datasheet

Section 17 D/A Converter
Rev.6.00 Sep. 27, 2007 Page 729 of 1268
REJ09B0220-0600
[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
re
f
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.
Conversion data 1
Conversion
result 1
High-impedance state
t
DCONV
DADR0
write cycle
DA0
DAOE0
DADR0
A
ddress
φ
DACR01
write cycle
Conversion data 2
Conversion
result 2
t
DCONV
Legend:
t
DCONV
: D/A conversion time
DADR0
write cycle
DACR01
write cycle
Figure 17.2 Example of D/A Converter Operation