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Section 15 A/D Converter
15.4.4
External Trigger Input Timing
A/D conversion can be externally triggered. When the TRGE bit is set to 1 in ADCR and the 8-bit
timer's ADTE bit is cleared to 0, external trigger input is enabled at the ADTRG pin. A high-to-
low transition at the ADTRG pin sets the ADST bit to 1 in ADCSR, starting A/D conversion.
Other operations, in both single and scan modes, are the same as if the ADST bit had been set to 1
by software. Figure 15.6 shows the timing.
φ
ADTRG
Internal trigger
signal
ADST
Rev. 4.00 Jan 26, 2006 page 586 of 938
REJ09B0276-0400
Figure 15.6 External Trigger Input Timing
A/D conversion
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