H8S2472 Datasheet, PDF (954/1250 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8S Family / H8S/2400 Series

Section 23 A/D Converter
23.4.4 Timing of External Trigger Input
A/D conversion can also be started by an externally input trigger signal. Setting the TRGS1 and
TRGS0 bits in ADCR to B'11 selects the signal on the ADTRG pin as an external trigger. The
ADST bit in ADCSR is set to 1 on the falling edge of ADTRG, initiating A/D conversion. Other
operations are the same as those in the case where the ADST bit is set to 1 by software, regardless
of whether the converter is in single mode or scan mode. The timing of this operation is shown in
figure 23.5.
φ
ADTRG
Internal trigger
signal
ADST
A/D conversion time
Figure 23.5 Timing of External Trigger Input
Rev. 2.00 Aug. 20, 2008 Page 906 of 1198
REJ09B0403-0200