RX610 Group
23. A/D Converter
R01UH0032EJ0120 Rev.1.20
Page 806 of 1006
Feb 20, 2013
23.6.11
Notes when Using Multiple Units of A/D Converter
Since the same power supply is used between the units of the A/D converter contained in the RX610 Group, when
multiple units are used and conversion start timing between each unit is different, conversion accuracy may get affected.
When the conversion accuracy is affected, adopt the following methods and perform an adequate evaluation.
(1) Example of recommended operation of simultaneous conversion of each unit at the time of
multiple unit operation
When multiple units of A/D converter are used, select the activation method of the trigger select bit as either activation
by compare match from TPU or activation by compare match from TMR, and match the conversion start timing and end
timing of each unit.
Figure 23.19 shows timing example (1) when the conversion timings of four units are simultaneous.
Figure 23.20 shows timing example (2) when the conversion timings of four units are simultaneous.
Unit 0
ADCLK
Unit 1
Unit 2
Unit 3
Successive approximation time
Successive approximation time
Successive approximation time
Successive approximation time
Timer activation
Input sampling time
Input sampling time
Input sampling time
Input sampling time
Identical state
Figure 23.19 Example (1) of Simultaneous Conversion Timings of Four Units
ADCLK
Conversion 1
Unit 0
Unit 0
Unit 2
Unit 3
One conversion
period
Compare match
Conversion 2
Conversion n
Conversion 1
Conversion 2
Conversion n
Conversion 1
Conversion 2
Conversion n
Conversion 1
Conversion 2
Conversion n
Figure 23.20 Example (2) of Simultaneous Conversion Timings of Four Units
Summary of Contents for RX600 Series
Page 1006: ...RX610 Group R01UH0032EJ0120 ...
