UPD78F0078GK-9ET-A Renesas Electronics America, UPD78F0078GK-9ET-A Datasheet - Page 245

• Manufacturer Part Number: UPD78F0078GK-9ET-A
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0078GK-9ET-A

• Lead Free Status / Rohs Status: Supplier Unconfirmed

(10) Timing at which A/D conversion result is undefined
(11) Notes on board design
The A/D conversion value may be undefined if the timing of completion of A/D conversion and the timing of
stopping the A/D conversion conflict. Therefore, read the A/D conversion result before stopping the A/D
operation.
Figure 13-18 shows the timing of reading the conversion result.
Locate analog circuits as far away from digital circuits as possible on the board because the analog circuits may
be affected by the noise of the digital circuits. In particular, do not cross an analog signal line with a digital signal
line, or wire an analog signal line in the vicinity of a digital signal line. Otherwise, the A/D conversion
characteristics may be affected by the noise of the digital line.
Connect AV
Figure 13-18. Timing of Reading Conversion Result (When Conversion Result Is Undefined)
SS0
INTAD0
ADCR0
ADCS0
and V
SS0
A/D conversion complete
at one location on the board where the voltages are stable.
Normal conversion result is read.
CHAPTER 13 A/D CONVERTER
User’s Manual U14260EJ4V0UD
Normal conversion result
A/D conversion complete
A/D conversion
is stopped.
Undefined value
Undefined value
is read.
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