M16C65 Datasheet, PDF (698/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
27. A/D Converter
27.3.2 A/D Conversion Start Conditions
An A/D conversion start trigger has a software trigger and an external trigger. Figure 27.4 shows A/D
Conversion Start Trigger.
ADST
ADTRG pin
TRG
0
1
A/D conversion start trigger
ADST, TRG: Bits in the ADCON0 register
Figure 27.4 A/D Conversion Start Trigger
27.3.2.1 Software Trigger
When the TRG bit in the ADCON0 register is 0 (software trigger), A/D conversion starts by setting the
ADST bit in the ADCON0 register to 1 (A/D conversion start).
27.3.2.2 External Trigger
When the TRG bit in the ADCON0 register is 1 (ADTRG trigger), A/D conversion starts if the input
level at the ADTRG pin changes from high to low under the following conditions:
• The direction bit of the port sharing a pin is set to 0 (input mode)
• The TRG bit in the ADCON0 register is set to 1 (ADTRG trigger)
• The ADST bit in the ADCON0 register is set to 1 (A/D conversion start)
Under the above conditions, when input to the ADTRG pin is changed from high to low, the A/D
conversion starts.
Set the high- and low-level durations of the pulse input to the ADTRG pin to two or more cycles of
fAD.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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