UPD78F1502AGK-GAK-AX Datasheet, PDF (405/1031 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)
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(6) 12-bit A/D conversion result register, 10-bit A/D conversion result register (ADCR)
The A/D conversion result is loaded from the successive approximation register to this register each time A/D
conversion is completed, and the ADCR register holds the A/D conversion result in its lower 12 bits (the higher 4 bits
are fixed to 0). 10-bit A/D conversion result register does not fix its lower 2 bits.
(7) 8-bit A/D conversion result register (ADCRH)
The A/D conversion result is loaded from the successive approximation register to this register each time A/D
conversion is completed, and the ADCRH register stores the higher 8 bits of the A/D conversion result.
(8) Controller
This circuit controls the conversion time of an input analog signal that is to be converted into a digital signal, as well
as starting and stopping of the conversion operation. When A/D conversion has been completed, this controller
generates INTAD.
(9) AVDD0, AVDD pin
This pin inputs an analog power to the A/D converter. When one or more of the pins of ports 2 and 15 are used as
the digital port pins, make AVDD0 the same potential as EVDD or VDD.
(10) AVSS pin
This is the ground potential pin of the A/D converter. Always use this pin at the same potential as that of the VSS pin
even when the A/D converter is not used.
The ground potential (AVSS) can also be used as the negative reference voltage (ADREFM) of the A/D converter. To
use AVSS as ADREFM, clear the ADREF bit of the ADVRC register to 0.
(11) AVREFP/VREFOUT pin
This pin is used to externally input the reference voltage (AVREFP) of the A/D converter or output the voltage (VREFOUT)
generated by the voltage reference.
To use AVREFP as the positive reference voltage (ADREFP) of the A/D converter, clear the VRON bit of the ADVRC
register to 0. To use VREFOUT as ADREFP, set the VRON bit to 1.
The analog signal input to ANI0 to ANI10, ANI15 is converted into a digital signal, based on the voltage applied
across ADREFP and ADREFM.
(12) AVREFM pin
This pin is used to externally input the reference voltage (AVREFM) of the A/D converter. To use AVREFM as the
negative reference voltage (ADREFM) of the A/D converter, set the ADREF bit of the ADVRC register to 1.
Remark 78K0R/LF3:
ANI0-ANI6, ANI15
78K0R/LG3, 78K0R/LH3: ANI0-ANI10, ANI15
(13) AVREF pin
This pin is used to externally input the reference voltage.
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011