232
2570N–AVR–05/11
ATmega325/3250/645/6450
25.6.4
Scanning the Analog Comparator
The relevant Comparator signals regarding Boundary-scan are shown in
Figure 25-7. The
Boundary-scan cell from
Figure 25-8 is attached to each of these signals. The signals are
The Comparator need not be used for pure connectivity testing, since all analog inputs are
shared with a digital port pin as well.
Figure 25-7. Analog Comparator
Figure 25-8. General Boundary-scan cell Used for Signals for Comparator and ADC
ACBG
BANDGAP
REFERENCE
ADC MULTIPLEXER
OUTPUT
ACME
AC_IDLE
ACO
ADCEN
ACD
0
1
DQ
G
0
1
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Cell
ClockDR
UpdateDR
ShiftDR
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EXTEST
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