A/D Converter Control Registers - NEC PD78076 User Manual

Caution A series resistor string of approximately 10 k
pin. Therefore, if the output impedance of the reference voltage source is high, AV
is connected in parallel with the series resistor string between AV
a result, the reference voltage error will increase.
(8) AV pin
SS
This is a GND potential pin of the A/D converter. Keep it at the same potential as the V
the A/D converter.
(9) AV pin
DD
This is an A/D converter analog power supply pin. Keep it at the same potential as the V
using the A/D converter.

15.3 A/D Converter Control Registers

The following three types of registers are used to control the A/D converter.
• A/D converter mode register (ADM)
• A/D converter input select register (ADIS)
• External interrupt mode register 1 (INTM1)
(1) A/D converter mode register (ADM)
This register sets the analog input channel for A/D conversion, conversion time, conversion start/stop and
external trigger.
ADM is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets ADM to 01H.
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CHAPTER 15 A/D CONVERTER
is connected between AV
pin and AV
REF0
pin when not using
SS
pin and AV
REF0 SS
pin
REF0
pin. As
SS
pin when not
SS