ATMEGA128-16AI Atmel, ATMEGA128-16AI Datasheet - Page 261

• Manufacturer Part Number: ATMEGA128-16AI
• Description: IC AVR MCU 128K 16MHZ 64-TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128-16AI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• For Use With: ATSTK501 - ADAPTER KIT FOR 64PIN AVR MCU
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Q1167170A

Scanning the ADC
2467V–AVR–02/11
Table 103. Boundary-scan Signals for the Analog Comparator
Figure 131
Boundary-scan cell from
used for pure connectivity testing, since all analog inputs are shared with a digital port pin as
well.
Figure 131. Analog to Digital Converter
The signals are described briefly in
Signal
Name
AC_IDLE
ACO
ACME
ACBG
NEGSEL_2
NEGSEL_1
NEGSEL_0
MUXEN_7
MUXEN_6
MUXEN_5
MUXEN_4
MUXEN_3
MUXEN_2
MUXEN_1
MUXEN_0
EXTCH
ADC_7
ADC_6
ADC_5
ADC_4
ADC_3
ADC_2
ADC_1
ADC_0
shows a block diagram of the ADC with all relevant control and observe signals. The
ADC_2
ADC_0
ADC_1
Direction as
Seen from the
Comparator
Input
Output
Input
Input
SCTEST
AMPEN
ACLK
G10
ST
Figure 127
To Comparator
Description
Turns off Analog
comparator when
true
Analog
Comparator
Output
Uses output
signal from ADC
mux when true
Bandgap
Reference enable
+
-
10x
Table
is attached to each of these signals. The ADC need not be
ADCBGEN
VCCREN
IREFEN
AREF
G20
104.
PASSEN
+
-
20x
1.22V
GNDEN
ACTEN
ref
Recommended
Input when not
in Use
1
Will become
input to µC code
being executed
0
0
2.56V
ref
PRECH
DAC_9..0
ADCEN
HOLD
Output values when
Recommended
Inputs are Used
Depends upon µC
code being executed
0
Depends upon µC
code being executed
Depends upon µC
code being executed
PRECH
AREF
10-bit DAC
ATmega128
AREF
+
-
DACOUT
COMP
COMP
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