ATmega32 Atmel Corporation, ATmega32 Datasheet - Page 29

• 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

Calibrated Internal
RC Oscillator
2503Q–AVR–02/11
Table 7. External RC Oscillator Operating Modes
When this Oscillator is selected, start-up times are determined by the SUT fuses as shown in
Table
Table 8. Start-up Times for the External RC Oscillator Clock Selection
Note:
The Calibrated Internal RC Oscillator provides a fixed 1.0, 2.0, 4.0, or 8.0MHz clock. All frequen-
cies are nominal values at 5V and 25°C. This clock may be selected as the system clock by
programming the CKSEL fuses as shown in
components. The CKOPT Fuse should always be unprogrammed when using this clock option.
During Reset, hardware loads the calibration byte for the 1MHz into the OSCCAL Register and
thereby automatically calibrates the RC Oscillator. At 5V, 25°C and 1.0MHz Oscillator frequency
selected, this calibration gives a frequency within ±3% of the nominal frequency. Using calibra-
tion methods as described in application notes available at www.atmel.com/avr it is possible to
achieve ±1% accuracy at any given V
Chip Clock, the Watchdog Oscillator will still be used for the Watchdog Timer and for the reset
time-out. For more information on the pre-programmed calibration value, see the section
bration Byte” on page
Table 9. Internal Calibrated RC Oscillator Operating Modes
Note:
SUT1..0
00
01
10
11
8.
1. This option should not be used when operating close to the maximum frequency of the device.
1. The device is shipped with this option selected.
CKSEL3..0
Start-up Time from
Power-down and
0101
0110
0111
1000
Power-save
CKSEL3..0
6 CK
18 CK
18 CK
18 CK
0001
0010
0011
0100
258.
(1)
(1)
Additional Delay
(V
from Reset
CC
CC
4.1ms
4.1ms
65ms
and Temperature. When this Oscillator is used as the
= 5.0V)
–
Table
Frequency Range (MHz)
9. If selected, it will operate with no external
Nominal Frequency (MHz)
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
Fast rising power or BOD enabled
8.0 - 12.0
0.1 - 0.9
0.9 - 3.0
3.0 - 8.0
1.0
2.0
4.0
8.0
ATmega32(L)
“Cali-
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