UPD78F1502AGK-GAK-AX Datasheet, PDF (427/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 10 12-BIT A/D CONVERTER (μ PD78F150xA),
10-BIT A/D CONVERTER (μ PD78F151xA)
Cautions 1. Make sure the period of <4> to <8> is 1 μs or more.
2. <4> may be done between <5> and <7>.
3. <4> can be omitted. However, ignore data of the first conversion after <8> in this case.
4. The period from <9> to <13> differs from the conversion time set using bits 5 to 1 (FR2 to
FR0, LV1, LV0) of ADM. The period from <12> to <13> is the conversion time set using FR2
to FR0, LV1, and LV0.
5. To use an operational amplifier output for an analog input, start operating the operational
amplifier before setting the A/D conversion operation (see CHAPTER 12 OPERATIONAL
AMPLIFIER). Furthermore, do not change the operational amplifier setting during the A/D
conversion operation.
6. To use an output voltage of the voltage reference for a positive reference voltage of A/D
converter, start operating the voltage reference before setting the A/D conversion operation
(see CHAPTER 13 VOLTAGE REFERENCE). Furthermore, do not change the voltage
reference setting during the A/D conversion operation.
7. When using the A/D converter in normal mode 2 (LV1 = 0, LV0 = 1) or low voltage mode (LV1
= 1, LV0 = 0), enable the input gate voltage boost circuit for the A/D converter by using the
analog reference voltage control register (ADVRC), and then set ADCE and ADCS to 1. After
the voltage boost circuit stabilization time (10 μs) passes after the input gate voltage boost
circuit for the A/D converter has been enabled, set ADCS to 1.
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011