RX610 Group
23. A/D Converter
R01UH0032EJ0120 Rev.1.20
Page 795 of 1006
Feb 20, 2013
23.3.4
Activation by External Triggers
External trigger signals (ADTRG0# to ADTRG3#) are capable of starting A/D conversion by each of the units.
For unit 0, when the setting of the AD0.ADCR.TRGS[2:0] bits is 011b (specifying ADTRG0# as a trigger), a falling
edge on the ADTRG0# pin leads to setting of the ADST (A/D conversion start) bit in AD0.ADCR to 1 and thus starts
A/D conversion. Figure 23.9 shows the timing.
An external trigger input is capable of simultaneously starting A/D conversion by two units (synchronized unit
activation). Simultaneous activation of units 0 and 1 by a falling edge of the ADTRG0# signal is specified by setting the
AD0.ADCR.TRGS[2:0] bits to 011b (specifying ADTRG0# as the trigger for unit 0) and the AD1.ADCR.TRGS[2:0] bits
to 111b (specifying ADTRG0# as the trigger for unit 1). Simultaneous activation of units 2 and 3 by a falling edge of the
ADTRG2# signal can be set up in the same way.
Take note that if the external trigger input is already at the low-level, selecting the external trigger may generate a falling
edge in the internal signal and thus start A/D conversion.
PCLK
ADTRG0#
Internal trigger
signal
ADCSR.ADST
A/D conversion
Figure 23.9 Timing of Activation by an External Trigger
Summary of Contents for RX600 Series
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