Renesas M16C/60 Series Hardware Manual page 211

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M16C/6N5 Group
(e) Current Consumption Reducing Function
When not using the A-D converter, its resistor ladder and reference voltage input pin (V
using the ADCON1 register's VCUT bit. When separated, no current will flow from the V
resistor ladder, helping to reduce the power consumption of the chip.
To use the A-D converter, set the VCUT bit to "1" (V
ADST bit to "1" (A-D conversion start). The VCUT and ADST bits cannot be set to "1" at the same time.
Nor can the VCUT bit be set to "0" (V
Note that this does not affect V
(f) Analog Input Pin and External Sensor Equivalent Circuit Example
Figure 1.16.10 shows analog input pin and external sensor equivalent circuit example.
Sensor equivalent
circuit
R
0
V
IN
Figure 1.16.10 Analog Input Pin and External Sensor Equivalent Circuit
Rev.1.00 2003.05.30 page 197
REF
unconnected) during A-D conversion.
REF
for the D-A converter (irrelevant).
REF
Microcomputer
R
C
V
C
connected) and then set the ADCON0 register's
Sampling time
Sample-and-hold function enabled:
Sample-and-hold function disabled:
A-D Converter
) can be separated
REF
pin into the
REF
3
f
AD
2
f
AD