CHAPTER 12 10-BIT A/D CONVERTER (
µ
PD789114, 789134 SUBSERIES)
User’s Manual U13045EJ2V0UM00
159
(4) Conversion results immediately following start of A/D conversion
The first A/D conversion value immediately following the start of A/D converter operation may be undefined.
Be sure to poll the A/D conversion end interrupt request (INTAD0) and perform processing such as annulling
the first conversion result.
(5) Timing that makes the A/D conversion result undefined
If the timing of the end of A/D conversion and the timing of the stop of operation of the A/C converter conflict,
the A/D conversion value may be undefined. Because of this, be sure to read out the A/D conversion result
while the A/D converter is in operation. Furthermore, when reading out an A/D conversion result after A/D
converter operation has stopped, be sure to have done so by the time the next conversion result is complete.
The conversion result readout timing is shown in Figures 12-8 and 12-9.
Figure 12-8. Conversion Result Readout Timing (When Conversion Result Is Undefined Value)
Figure 12-9. Conversion Result Readout Timing (When Conversion Result Is Normal Value)
A/D conversion end
A/D conversion end
Normal conversion result
Undefined value
Normal conversion result read out
Undefined value read out
A/D operation stopped
ADCR0
INTAD0
ADCS0
Normal conversion result
A/D conversion end
Normal conversion result read out
A/D operation stopped
ADCR0
INTAD0
ADCS0
Summary of Contents for mPD789101
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