Operation - Renesas H8SX/1650 Hardware Manual

15.4

Operation

The D/A converter includes D/A conversion circuits for two channels, each of which can operate
independently. When the DAOE bit in DACR01 is set to 1, D/A conversion is enabled and the
conversion result is output.
An operation example of D/A conversion on channel 0 is shown below. 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 to start D/A conversion. The conversion result is output
from the analog output pin DA0 after the conversion time t
result continues to be output until DADR0 is written to again or the DAOE0 bit is cleared to 0.
The output value is expressed by the following formula:
Contents of DADR/256 × V
3. If DADR0 is written to again, the conversion is immediately started. The conversion result is
output after the conversion time t
4. If the DAOE0 bit is cleared to 0, analog output is disabled.
Pφ
Address
DADR0
DAOE0
DA0
High-impedance state
[Legend]
t : D/A conversion time
DCONV
ref
has elapsed.
DCONV
DADR0 DACR01
write cycle write cycle
Conversion data 1
Figure 15.2 Example of D/A Converter Operation
DCONV
DADR0
write cycle
Conversion
result 1
t
DCONV
Rev.2.00 Jun. 28, 2007 Page 549 of 666
Section 15 D/A Converter
has elapsed. The conversion
DACR01
write cycle
Conversion data 2
Conversion
result 2
t
DCONV
REJ09B0311-0200