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Setting the TRGS1 and TRGS0 bits in ADCR according to the procedure overleaf invalidates the
external trigger input.
See figure 22.8 for details of the procedure in cases where 2. or 3. is applicable.
Note: * Overwrite the TRGS1 and TRGS0 bits settings at the same time (in a byte unit).
Figure 22.8 Procedure for Changing Modes when Starting of the A/D Converter by an
Extaernal trigger
shut off?
ADCR. TRGS1 = 0
ADCR. TRGS0 = 0
(to invalidate the external trigger)*
ADCSR. ADST = 0
Change the scan mode
change the extaernal
trigger setting*
External Trigger has been Selected
Yes
No
Rev. 1.00 May 09, 2008 Page 711 of 954
Section 22 A/D Converter
REJ09B0462-0100
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