ATmega6450 Atmel Corporation, ATmega6450 Datasheet - Page 233

• Manufacturer Part Number: ATmega6450
• Manufacturer: Atmel Corporation

Specifications of ATmega6450

• Flash (kbytes): 64 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 69
• Ext Interrupts: 25
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

25.6.5
2570N–AVR–05/11
Scanning the ADC
Table 25-4.
Figure 25-9
Boundary-scan cell from
used for pure connectivity testing, since all analog inputs are shared with a digital port pin as
well.
Figure 25-9. 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
ADC_2
ADC_0
shows a block diagram of the ADC with all relevant control and observe signals. The
ADC_1
Direction as
Seen from the
Comparator
Boundary-scan Signals for the Analog Comparator
output
input
input
input
SCTEST
AMPEN
ACLK
ST
Figure 25-5
To Comparator
Description
Turns off Analog
Comparator when
true
Analog
Comparator Output
Uses output signal
from ADC mux
when true
Bandgap
Reference enable
+
-
1x
Table
ADCBGEN
is attached to each of these signals. The ADC need not be
VCCREN
IREFEN
AREF
25-5.
PASSEN
ATmega325/3250/645/6450
ACTEN
1.22V
GNDEN
ref
Recommended
Input when Not
in Use
Will become
input to µC code
being executed
1.11V
ref
1
0
0
PRECH
DAC_9..0
ADCEN
HOLD
Output Values when
Recommended
Inputs are Used
Depends upon µC
code being executed
Depends upon µC
code being executed
Depends upon µC
code being executed
PRECH
AREF
10-bit DAC
0
AREF
+
-
DACOUT
COMP
COMP
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