UPD78F9418A NEC, UPD78F9418A Datasheet - Page 163

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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(6)
Figure 11-8. Conversion Result Readout Timing (When Conversion Result Is Undefined Value)
Noise elimination
To maintain a resolution of 10 bits, it is necessary to avoid for noise at the AV
The higher the output impedance of the analog input source, the larger the effect by noise. To eliminate
noise, attach an external capacitor to the relevant pins as shown in Figure 11-10.
Figure 11-9. Conversion Result Readout Timing (When Conversion Result Is Normal Value)
ADCR0
INTAD0
ADCS0
INTAD0
ADCS0
ADCR0
Normal conversion result read out
A/D conversion end
A/D conversion end
A/D operation stopped
User’s Manual U13952EJ3V0UD
Normal conversion result
Normal conversion result
Normal conversion
A/D conversion end
result read out
A/D operation
stopped
Undefined value
Undefined value
REF
read out
and ANI0 to ANI6 pins.
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