NEC 78K0S/KA1+ User Manual page 169

The setting method is described below.
<1> Set bit 0 (ADCE) of the A/D converter mode register (ADM) to 1.
<2> Select the channel and conversion time using bits 1 and 0 (ADS1, ADS0) of the analog input channel
specification register (ADS) and bits 5 to 3 (FR2 to FR0) of ADM.
<3> Execute two NOP instructions or an instruction equivalent to two machine cycles.
<4> Set bit 7 (ADCS) of ADM to 1 to start A/D conversion.
<5> An interrupt request signal (INTAD) is generated.
<6> Transfer the A/D conversion data to the A/D conversion result register (ADCR, ADCRH).
<Change the channel>
<7> Change the channel using bits 1 and 0 (ADS1, ADS0) of ADS.
<8> An interrupt request signal (INTAD) is generated.
<9> Transfer the A/D conversion data to the A/D conversion result register (ADCR, ADCRH).
<Complete A/D conversion>
<10> Clear ADCS to 0.
<11> Clear ADCE to 0.
Cautions 1. Make sure the period of <1> to <4> is 1
2. It is no problem if the order of <1> and <2> is reversed.
3. <1> can be omitted. However, ignore the data resulting from the first conversion after
<4> in this case.
4. The period from <5> to <8> differs from the conversion time set using bits 5 to 3 (FR2 to
FR0) of ADM. The period from <7> to <8> is the conversion time set using FR2 to FR0.
CHAPTER 10 A/D CONVERTER
µ
s or more.
User's Manual U16898EJ3V0UD
169