Panasonic MN101C77C - Manual (Page 495)

Operation XVI - 3
Chapter 16 D/A Converter
16-2 Operation
The D/A converter circuit setup procedure is as follows:
(1) Set the analog pins.
Set the analog input pin, set in (2), to "special function pin" by the port A input mode
register (PAIMD).
* Setup for the port A input mode register should be done before analog voltage is put to pins.
(2) Select the analog output pin.
Select the analog output pin from DA1 to DA0 (PA1 to PA0) by the DACH1 to DACH0 flag of
the D/A converter control register (DACTR).
(3) Start D/A conversion
Set the DABUSY flag of the D/A converter control register (DACTR) to "1" to apply the
ladder resistance current. D/A conversion starts.
(4) DA output.
D/A conversion is done for the data which is set to DADR01 register, and the result of
D/A conversion is output to DA0 and DA1.