Renesas rl78 User Manual

RL78/G1A

CHAPTER 11 A/D CONVERTER

R01UH0305EJ0200 Rev.2.00

341

Jul 04, 2013

Various A/D conversion modes can be specified by using the mode combinations below.

Software trigger

Conversion is started by software manipulation.

Hardware trigger no-wait mode

Conversion is started by detecting a hardware trigger.

Trigger mode

Hardware trigger wait mode

The power is turned on by detecting a hardware trigger while the

system is off and in the conversion standby state, and

conversion is then started automatically after the A/D power

supply stabilization wait time passes.

When using the SNOOZE mode function, specify the hardware

trigger wait mode.

Select mode

A/D conversion is performed on the analog input of one selected

channel.

Channel selection

mode

Scan mode

A/D conversion is performed on the analog input of four channels

in order. Four consecutive channels can be selected from ANI0

to ANI12 as analog input channels.

One-shot conversion mode

A/D conversion is performed on the selected channel once.

Conversion operation

mode

Sequential conversion mode

A/D conversion is sequentially performed on the selected

channels until it is stopped by software.

Operation Mode

Note

Number of Sampling Clock

Normal 1

11 f

Normal 2

23 f

Low-voltage 1

33 f

Low-voltage 2

187 f

Set a value to the number of sampling clocks, at which the
sampling capacitor is fully charged, depending on the output
impedance of the analog input source.

Note

The operation modes selectable differ depending on the analog input channel, AV

voltage, trigger mode, and

CLK

. For details, Table 11-3 A/D Conversion Time Selection.

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