ATmega32 Atmel Corporation, ATmega32 Datasheet - Page 56

• Manufacturer Part Number: ATmega32
• 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

Special Function I/O
Register – SFIOR
Alternate Functions of
Port A
2503Q–AVR–02/11
• Bit 2 – PUD: Pull-up disable
When this bit is written to one, the pull-ups in the I/O ports are disabled even if the DDxn and
PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01). See
figuring the Pin” on page 50
Port A has an alternate function as analog input for the ADC as shown in
A pins are configured as outputs, it is essential that these do not switch when a conversion is in
progress. This might corrupt the result of the conversion.
Table 22. Port A Pins Alternate Functions
Table 23
Figure 26 on page
Table 23. Overriding Signals for Alternate Functions in PA7..PA4
Bit
Read/Write
Initial Value
Signal Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
Port Pin
and
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
ADTS2
R/W
Table 24
7
0
PA7/ADC7
54.
ADC7 INPUT
ADTS1
R/W
relate the alternate functions of Port A to the overriding signals shown in
6
0
Alternate Function
ADC7 (ADC input channel 7)
ADC6 (ADC input channel 6)
ADC5 (ADC input channel 5)
ADC4 (ADC input channel 4)
ADC3 (ADC input channel 3)
ADC2 (ADC input channel 2)
ADC1 (ADC input channel 1)
ADC0 (ADC input channel 0)
0
0
0
0
0
0
0
0
–
for more details about this feature.
ADTS0
R/W
5
0
PA6/ADC6
ADC6 INPUT
R
4
–
0
0
0
0
0
0
0
0
0
–
ACME
R/W
3
0
PA5/ADC5
ADC5 INPUT
PUD
R/W
2
0
0
0
0
0
0
0
0
0
–
PSR2
R/W
1
0
ATmega32(L)
PA4/ADC4
PSR10
ADC4 INPUT
R/W
Table
0
0
0
0
0
0
0
0
0
0
–
22. If some Port
SFIOR
“Con-
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