ATmega32 Atmel Corporation, ATmega32 Datasheet - Page 214
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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:
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Part Number:
ATmega32-16PU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
ADC Multiplexer
Selection Register –
ADMUX
2503Q–AVR–02/11
Table 82. Correlation between Input Voltage and Output Codes
Example:
• Bit 7:6 – REFS1:0: Reference Selection Bits
These bits select the voltage reference for the ADC, as shown in
changed during a conversion, the change will not go in effect until this conversion is complete
(ADIF in ADCSRA is set). The internal voltage reference options may not be used if an external
reference voltage is being applied to the AREF pin.
Table 83. Voltage Reference Selections for ADC
• Bit 5 – ADLAR: ADC Left Adjust Result
The ADLAR bit affects the presentation of the ADC conversion result in the ADC Data Register.
Write one to ADLAR to left adjust the result. Otherwise, the result is right adjusted. Changing the
ADLAR bit will affect the ADC Data Register immediately, regardless of any ongoing conver-
Bit
Read/Write
Initial Value
V
V
V
...
V
V
V
...
V
V
REFS1
V
ADCn
ADCm
ADCm
ADCm
ADCm
ADCm
ADCm
ADCm
ADCm
ADMUX = 0xED (ADC3 - ADC2, 10x gain, 2.56V reference, left adjusted result)
Voltage on ADC3 is 300 mV, voltage on ADC2 is 500 mV.
ADCR = 512 × 10 × (300 - 500) / 2560 = -400 = 0x270
ADCL will thus read 0x00, and ADCH will read 0x9C. Writing zero to ADLAR right adjusts
the result: ADCL = 0x70, ADCH = 0x02.
0
0
1
1
+ 511/512 V
+ 510/512 V
+ 1/512 V
- 1/512 V
- 511/512 V
- V
+ V
REF
REF
REFS0
/GAIN
/GAIN
REFS1
0
1
0
1
R/W
REF
7
0
REF
REF
REF
REF
/GAIN
/GAIN
/GAIN
Voltage Reference Selection
AREF, Internal Vref turned off
AVCC with external capacitor at AREF pin
Reserved
Internal 2.56V Voltage Reference with external capacitor at AREF pin
/GAIN
/GAIN
REFS0
R/W
6
0
ADLAR
R/W
5
0
Read code
0x1FF
0x1FF
0x1FE
...
0x001
0x000
0x3FF
...
0x201
0x200
MUX4
R/W
4
0
MUX3
R/W
3
0
Corresponding Decimal Value
511
511
510
...
1
0
-1
...
-511
-512
MUX2
R/W
2
0
MUX1
R/W
1
0
Table
ATmega32(L)
MUX0
R/W
0
0
83. If these bits are
ADMUX
214