ATmega32 Atmel Corporation, ATmega32 Datasheet - Page 25

• 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

ADC Clock – clk
Clock Sources
Default Clock
Source
2503Q–AVR–02/11
ADC
The ADC is provided with a dedicated clock domain. This allows halting the CPU and I/O clocks
in order to reduce noise generated by digital circuitry. This gives more accurate ADC conversion
results.
The device has the following clock source options, selectable by Flash Fuse bits as shown
below. The clock from the selected source is input to the AVR clock generator, and routed to the
appropriate modules.
Table 2. Device Clocking Options Select
Note:
The various choices for each clocking option is given in the following sections. When the CPU
wakes up from Power-down or Power-save, the selected clock source is used to time the start-
up, ensuring stable Oscillator operation before instruction execution starts. When the CPU starts
from Reset, there is as an additional delay allowing the power to reach a stable level before
commencing normal operation. The Watchdog Oscillator is used for timing this real-time part of
the start-up time. The number of WDT Oscillator cycles used for each time-out is shown in
3. The frequency of the Watchdog Oscillator is voltage dependent as shown in
mary” on page
Table 3. Number of Watchdog Oscillator Cycles
The device is shipped with CKSEL = “0001” and SUT = “10”. The default clock source setting is
therefore the 1MHz Internal RC Oscillator with longest startup time. This default setting ensures
that all users can make their desired clock source setting using an In-System or Parallel
Programmer.
Device Clocking Option
External Crystal/Ceramic Resonator
External Low-frequency Crystal
External RC Oscillator
Calibrated Internal RC Oscillator
External Clock
Typ Time-out (V
1. For all fuses “1” means unprogrammed while “0” means programmed.
4.1ms
65ms
327.
CC
= 5.0V)
Typ Time-out (V
(1)
4.3ms
69s
CC
= 3.0V)
Number of Cycles
64K (65,536)
4K (4,096)
1111 - 1010
1000 - 0101
0100 - 0001
ATmega32(L)
CKSEL3..0
1001
0000
“Register Sum-
Table
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