ATmega32 Atmel Corporation, ATmega32 Datasheet - Page 234
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ATmega32
Manufacturer Part Number
ATmega32
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32
Flash (kbytes)
32 Kbytes
Pin Count
44
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
3
Usb Speed
No
Usb Interface
No
Spi
1
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)
2
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATmega32-16AC
Manufacturer:
COMPAL
Quantity:
500
Part Number:
ATmega32-16AU
Manufacturer:
ATMEL
Quantity:
20 000
Part Number:
ATmega32-16PI
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Part Number:
ATmega32-16PU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Table 90. Boundary-scan Signals for the Analog Comparator
Scanning the ADC
Figure 123
Figure 122
inputs are shared with a digital port pin as well.
Figure 123. Analog to Digital Converter
The signals are described briefly in
2503Q–AVR–02/11
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 Boundary-scan cell from
is attached to each of these signals. The ADC need not be used for pure connectivity testing, since all analog
ADC_2
ADC_0
ADC_1
Direction as Seen from
the Comparator
Input
Output
Input
Input
SCTEST
AMPEN
ACLK
G10
ST
Table
To Comparator
Description
Turns off Analog
comparator when true
Analog Comparator
Output
Uses output signal from
ADC mux when true
Bandgap Reference
enable
+
-
10x
91.
G20
ADCBGEN
VCCREN
IREFEN
AREF
PASSEN
+
-
20x
1.22V
GNDEN
ACTEN
ref
Recommended Input
when Not in Use
Will become input to µC
code being executed
2.56V
ref
1
0
0
PRECH
DAC_9..0
ADCEN
HOLD
PRECH
AREF
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
10-bit DAC
AREF
ATmega32(L)
+
-
DACOUT
COMP
234