NEC uPD78P078 - Manual (Page 311)

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CHAPTER 16 D/A CONVERTER
(1) D/A conversion value set register 0, 1 (DACS0, DACS1)
DACS0 and DACS1 are registers that set the value used to determine analog voltage values output to the
ANO0 and ANO1 pins, re-spectively.
DACS0 and DACS1 are set with 8-bit memory manipulation instructions.
RESET input sets these registers to 00H.
Analog voltage output to the ANO0 and ANO1 pins is determined by the following expression.
ANOn output voltage = AV
REF1
x
where, n = 0, 1
Cautions 1. In the real-time output mode, when data that are set in DACS0 and DACS1 are read before
an output trigger is generated, the previous data are read rather than the set data.
2. In the real-time output mode, data should be set to DACS0 and DACS1 after an output
trigger and before the next output trigger.
DACSn
256