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ATmega128
Table 103. Boundary-scan Signals for the Analog Comparator
Direction as
Recommended
Output values when
Signal
Seen from the
Input when not
Recommended
Name
AC_IDLE
Comparator
Input
Description
Turns off Analog
in Use
1
Inputs are Used
Depends upon μC
comparator when
true
code being executed
ACO
Output
Analog
W ill become
0
Comparator
Output
input to μC code
being executed
ACME
Input
Uses output
0
Depends upon μC
signal from ADC
mux when true
code being executed
ACBG
Input
Bandgap
0
Depends upon μC
Reference enable
code being executed
Scanning the ADC
Figure 131 shows a block diagram of the ADC with all relevant control and observe signals. The
Boundary-scan cell from Figure 127 is attached to each of these signals. The ADC need not be
used for pure connectivity testing, since all analog inputs are shared with a digital port pin as
well.
Figure 131. Analog to Digital Converter
VCCREN
AREF
IREFEN
2.56V
MUXEN_7
ADC_7
MUXEN_6
ADC_6
MUXEN_5
ADC_5
To Comparator
PASSEN
ref
MUXEN_4
ADC_4
SCTEST
ADCBGEN
EXTCH
MUXEN_3
1.22V
ref
PRECH
PRECH
AREF
AREF
ADC_3
MUXEN_2
ADC_2
DAC_9..0
DACOUT
MUXEN_1
10-bit DAC
+
COMP
COMP
ADC_1
MUXEN_0
ADC_0
G10
+
G20
+
ACTEN
ADCEN
-
NEGSEL_2
10x
20x
ADC_2
-
-
HOLD
NEGSEL_1
NEGSEL_0
ADC_1
ADC_0
ST
ACLK
GNDEN
AMPEN
The signals are described briefly in Table 104 .
261
2467X–AVR–06/11
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