
391
Chapter 11
A/D Converter
User’s Manual U16702EE3V2UD00
11.5 Extended
Functions
11.5.1 Automatic
discharge
operation
The automatic discharge operation internally connects the sample and hold circuit to GND in order to
catch open analog inputs and other failure modes. This function is disabled by default and is controlled
by the ADVMS0 register (refer to
11.3 ”Control Registers” on page 371
).
11.5.2 Diagnostic
mode
The diagnostic mode configures the A/D converter to perform a conversion operation on the AV
REF0
and AV
SS
terminals. Using this mode allows the user to implement a software algorithm in the
application program to calibrate conversion results and thereby reduce the effect of certain error factors
such as full scale error and zero offset error. This mode is disabled by default, and is controlled by the
ADVMS0 register (refer to
11.3 ”Control Registers” on page 371
).
(1)
Operation in select mode and continuous select mode
In these modes, AV
REF0
or AV
SS
terminals can be selected using the ANISn bits of register
ADSCM0L. The A/D conversion result is stored in the appropriate conversion result register and
interrupt (INTAD) is output. Operation is performed in the same manner described in
11.4.3
”Operation mode” on page 383
.
(2)
Operation in scan mode and continuous scan mode
In this mode, AV
REF0
and AV
SS
terminals are scanned immediately after A/D conversion of the
Scan mode conversion end channel specified in register ADSCM0L. The A/D conversion result is
stored in the appropriate conversion result register and interrupt (INTAD) is output. Operation is
performed in the same manner described in
11.4.3 ”Operation mode” on page 383
.
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