MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 221

• Manufacturer Part Number: MC-78F0712-KIT
• Description: KIT REF SYSTEM 78K0 UPD78F0712
• Manufacturer: Renesas Electronics America

Specifications of MC-78F0712-KIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

<Change the channel>
<Complete A/D conversion>
When used as power-fail detection function
<1> Set bit 7 (PFEN) of the power-fail comparison mode register (PFM).
<2> Set power-fail comparison condition using bit 6 (PFCM) of PFM.
<3> Set bit 0 (ADCS2) of the A/D converter mode register (ADM) to 1.
<4> Select the channel and conversion time using bits 2 to 0 (ADS2 to ADS0) of the analog input channel
<5> Set a threshold value to the power-fail comparison threshold register (PFT).
<6> Set bit 7 (ADCS) of ADM to 1.
<7> Transfer the A/D conversion data to the A/D conversion result register (ADCR).
<8> The higher 8 bits of ADCR and PFT are compared and an interrupt request signal (INTAD) is generated
<9> Change the channel using bits 2 to 0 (ADS2 to ADS0) of ADS.
<10> Transfer the A/D conversion data to the A/D conversion result register (ADCR).
<11> The higher 8 bits of ADCR and the power-fail comparison threshold register (PFT) are compared and an
<12> Clear ADCS to 0.
<13> Clear ADCS2 to 0.
Cautions 1. Make sure the period of <3> to <6> is 1 s or more.
Remark Regardless of the select mode and scan mode, a compare operation is always performed for all the
specification register (ADS) and bits 5 to 1 (FR2 to FR0, ADHS1, ADHS0) of ADM.
if the conditions match.
interrupt request signal (INTAD) is generated if the conditions match.
A/D conversion results when the power fail detection function is enabled.
2. It is no problem if the order of <3>, <4>, and <5> is changed.
3. <3> must not be omitted if the power-fail detection function is used.
4. The period from <7> to <11> differs from the conversion time set using bits 5 to 1 (FR2 to
FR0, ADHS1, ADHS0) of ADM. The period from <9> to <11> is the conversion time set
using FR2 to FR0, ADHS1, and ADHS0.
CHAPTER 13 A/D CONVERTER
User’s Manual U17890EJ2V0UD
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