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ATmega32A Datasheet(PDF) 242 Page - ATMEL Corporation

Part # ATmega32A
Description  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  352 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega32A Datasheet(HTML) 242 Page - ATMEL Corporation

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242
8155B–AVR–07/09
ATmega32A
24.5.6
Scanning the ADC
Figure 24-10 shows a block diagram of the ADC with all relevant control and observe signals. The Boundary-scan cell from
Figure 24-9 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 24-10. Analog to Digital Converter
The signals are described briefly in Table 24-5.
Table 24-4.
Boundary-scan Signals for the Analog Comparator
Signal
Name
Direction as Seen from
the Comparator
Description
Recommended Input
when Not in Use
Output Values when
Recommended Inputs are Used
AC_IDLE
Input
Turns off Analog
comparator when true
1
Depends upon µC code being
executed
ACO
Output
Analog Comparator
Output
Will become input to µC
code being executed
0
ACME
Input
Uses output signal from
ADC mux when true
0
Depends upon µC code being
executed
ACBG
Input
Bandgap Reference
enable
0
Depends upon µC code being
executed
10-bit DAC
+
-
AREF
PRECH
DACOUT
COMP
MUXEN_7
ADC_7
MUXEN_6
ADC_6
MUXEN_5
ADC_5
MUXEN_4
ADC_4
MUXEN_3
ADC_3
MUXEN_2
ADC_2
MUXEN_1
ADC_1
MUXEN_0
ADC_0
NEGSEL_2
ADC_2
NEGSEL_1
ADC_1
NEGSEL_0
ADC_0
EXTCH
+
-
+
-
10x
20x
G10
G20
ST
ACLK
AMPEN
2.56V
ref
IREFEN
AREF
VCCREN
DAC_9..0
ADCEN
HOLD
PRECH
GNDEN
PASSEN
ACTEN
SCTEST
ADCBGEN
To Comparator
1.22V
ref
AREF



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