255
CHAPTER 14 D/A CONVERTER
User’s Manual U12697EJ3V0UM
14.4 Operation
<1> Select the operation mode in channel 0 in DAM0 of D/A converter mode register 0 (DAM0) and the operation
mode of the channel 1 in DAM1 of D/A converter mode register 1 (DAM1).
<2> Set the data that corresponds to the analog voltages that are output to pins ANO0/P130 and ANO1/P131 of
D/A conversion setting registers 0 and 1 (DACS0, DACS1).
<3> Set DACE0 of DAM0 and DACE1 of DAM1 to start D/A conversion in channels 0 and 1.
<4> After D/A conversion in the normal mode, the analog voltages at pins ANO0/P130 and ANO1/P131 are
immediately output. In the real-time output mode, the analog voltage is output synchronized to the output trigger.
<5> In the normal mode, the output analog voltages are maintained until new data are set in DACS0 and DACS1.
In the real-time output mode, after new data are set in DACS0 and DACS1, they are held until the next output
trigger is generated.
Caution Set DACE0 and DACE1 after data are set in DACS0 and DACS1.
14.5 Cautions
(1) Output impedance of the D/A converters
Since the output impedance of the D/A converters are high, the current cannot be taken from the ANOn pin (n
= 0,1). If the input impedance of the load is low, insert a buffer amp between the load and the ANOn pin. In
addition, use the shortest possible wire from the buffer amp or load (to increase the output impedance). If the
wire is long, surround it with a ground pattern.
