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M32C83T Datasheet(PDF) 262 Page - Renesas Technology Corp

Part # M32C83T
Description  16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES
PDF  527 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M32C83T Datasheet(HTML) 262 Page - Renesas Technology Corp

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Page 239
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17. A/D Converter
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17.2.8 Power Consumption Reducing Function
When the A/D converter is not used, the VCUT bit in the ADiCON1 register (i=0, 1) isolates the resistor
ladder of the A/D converter from the reference voltage input pin (VREF). Power consumption is reduced by
shutting off any current flow into the resistor ladder from the VREF pin.
When using the A/D converter, set the VCUT bit to "1" (VREF connection) before setting the ADST bit in
the ADiCON0 register to "1" (A/D conversion started). Do not set the ADST bit and VCUT bit to "1"
simultaneously, nor set the VCUT bit to "0" (no VREF connection) during the A/D conversion. The VCUT
bit does not affect the VREF performance of the D/A converter.
17.2.9 Analog Input Pin and External Sensor Equivalent Circuit
Figure 17.9 shows an example of the analog input pin and external sensor equivalent circuit.
Figure 17.9 Analog Input Pin and External Sensor Equivalent Circuit
R0
R (7.8k
)
C (2.0pF)
VIN
Microcomputer
Sensor equivalent
circuit
VC
Sampling time
(the time needed until the capacitor is fully
charged after closing switch)
Sample and hold function is enabled :
3
φAD
2
φAD
Sample and hold function is disabled :



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