ATMEGA128A-AN Atmel, ATMEGA128A-AN Datasheet - Page 265

• Manufacturer Part Number: ATMEGA128A-AN
• Description: IC MCU AVR 128K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128A-AN

• 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP
• Core: AVR8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

24.13.6
8151H–AVR–02/11
Scanning the ADC
Table 24-4.
Figure 24-13
The Boundary-scan cell from
not be used for pure connectivity testing, since all analog inputs are shared with a digital port pin
as well.
Figure 24-13. Analog to Digital Converter
The signals are described briefly in
Signal
Name
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
ADC_2
ADC_0
ADC_1
Direction as
Seen from the
Comparator
Output
Input
Input
shows a block diagram of the ADC with all relevant control and observe signals.
Boundary-scan Signals for the Analog Comparator
SCTEST
AMPEN
ACLK
G10
ST
To Comparator
Figure 24-8
+
-
10x
Description
Analog Comparator
Output
Uses output signal
from ADC mux
when true
Bandgap Reference
enable
Table
ADCBGEN
VCCREN
IREFEN
AREF
G20
24-5.
is attached to each of these signals. The ADC need
PASSEN
+
-
20x
1.22V
GNDEN
ACTEN
ref
2.56V
ref
Recommended
Input when not
in Use
Will become input
to µC code being
executed
0
0
PRECH
DAC_9..0
ADCEN
HOLD
PRECH
AREF
10-bit DAC
ATmega128A
Output values when
Recommended Inputs
are Used
0
Depends upon µC code
being executed
Depends upon µC code
being executed
AREF
+
-
DACOUT
COMP
COMP
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