HD6413007F20 Datasheet, PDF (570/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

16. D/A Converter
Bit 0⎯D/A Standby Enable (DASTE): Enables or disables D/A output in software standby
mode.
Bit 0
DASTE
0
1
Description
D/A output is disabled in software standby mode
D/A output is enabled in software standby mode
(Initial value)
16.3 Operation
The D/A converter has two built-in D/A conversion circuits that can perform conversion
independently.
D/A conversion is performed constantly while enabled in DACR. If the DADR0 or DADR1 value
is modified, conversion of the new data begins immediately. The conversion results are output
when bits DAOE0 and DAOE1 are set to 1.
An example of D/A conversion on channel 0 is given next. Timing is indicated in figure 16.2.
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.
Rev.5.00 Sep. 12, 2007 Page 540 of 764
REJ09B0396-0500