Renesas RL78 Series User Manual page 336

RL78/G1D
(5) Successive approximation register (SAR)
The SAR register is a register that sets voltage tap data whose values from the comparison voltage generator match
the voltage values of the analog input pins, 1 bit at a time starting from the most significant bit (MSB).
If data is set in the SAR register all the way to the least significant bit (LSB) (end of A/D conversion), the contents of
the SAR register (conversion results) are held in the A/D conversion result register (ADCR). When all the specified
A/D conversion operations have ended, an A/D conversion end interrupt request signal (INTAD) is generated.
(6) 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 higher 10 bits (the lower 6 bits
are fixed to 0).
(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 through the A/D conversion result upper limit/lower limit comparator.
(9) AV pin
REFP
This pin inputs an external reference voltage (AV
If using AV as the + side reference voltage of the A/D converter, set the ADREFP1 and ADREFP0 bits of A/D
REFP
converter mode register 2 (ADM2) to 0 and 1, respectively.
The analog signals input to ANI16 to ANI19 are converted to digital signals based on the voltage applied between
AV and the – side reference voltage (AV
REFP
In addition to AV
REFP
voltage of the A/D converter.
(10) AV pin
REFM
This pin inputs an external reference voltage (AV
converter, set the ADREFM bit of the ADM2 register to 1.
In addition to AV , it is possible to select V
REFM
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
REFM
, it is possible to select V
SS
).
REFP
/V ).
SS
or the internal reference voltage (1.45 V) as the + side reference
DD
). If using AV
REFM REFM
as the – side reference voltage of the A/D converter.
CHAPTER 12 A/D CONVERTER
as the – side reference voltage of the A/D
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