NEC PD78F9488 - Manual (Page 183)

CHAPTER 10 10-BIT A/D CONVERTER
User’s Manual U15331EJ4V1UD
183
(5) Timing of undefined A/D conversion result
The A/D conversion value may become undefined if the timing of the completion of A/D conversion and the
timing to stop the A/D conversion operation conflict. Therefore, read the A/D conversion result while the A/D
conversion operation is in progress. To read the A/D conversion result after the A/D conversion operation
has been stopped, stop the A/D conversion operation before the next conversion operation is completed.
Figures 10-8 and 10-9 show the timing at which the conversion result is read.
Figure 10-8. Conversion Result Read Timing (if Conversion Result Is Undefined)
End of A/D conversion End of A/D conversion
Normal conversion result Undefined value
Normal conversion result is read. A/D conversion
stops.
Undefined value
is read.
ADCRL0
INTAD0
ADCS0
Figure 10-9. Conversion Result Read Timing (if Conversion Result Is Normal)
Normal conversion result
End of A/D conversion
Normal conversion
result is read.
A/D conversion stops.
ADCRL0
INTAD0
ADCS0