upd78f0124m6gba1-8et Renesas Electronics Corporation., upd78f0124m6gba1-8et Datasheet - Page 250

• Manufacturer Part Number: upd78f0124m6gba1-8et
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(5) ANI0/P20 to ANI7/P27
(6) Input impedance of ANI0 to ANI7 pins
(7) AV
250
<1> The analog input pins (ANI0 to ANI7) are also used as input port pins (P20 to P27).
<2> If a digital pulse is applied to the pins adjacent to the pins currently used for A/D conversion, the expected
In this A/D converter, the internal sampling capacitor is charged and sampling is performed for approx. one sixth
of the conversion time.
Since only the leakage current flows other than during sampling and the current for charging the capacitor also
flows during sampling, the input impedance fluctuates and has no meaning.
To perform sufficient sampling, however, it is recommended to make the output impedance of the analog input
source 10 kΩ or lower, or attach a capacitor of around 100 pF to the ANI0 to ANI7 pins (see Figure 12-19).
A series resistor string of several tens of kΩ is connected between the AV
Therefore, if the output impedance of the reference voltage source is high, this will result in a series connection to
the series resistor string between the AV
REF
When A/D conversion is performed with any of ANI0 to ANI7 selected, do not access port 2 while
conversion is in progress; otherwise the conversion resolution may be degraded.
value of the A/D conversion may not be obtained due to coupling noise. Therefore, do not apply a pulse to
the pins adjacent to the pin undergoing A/D conversion.
pin input impedance
CHAPTER 12 A/D CONVERTER
REF
User’s Manual U16315EJ3V1UD
and AV
SS
pins, resulting in a large reference voltage error.
REF
and AV
SS
pins.