ATmega32C1 Automotive Atmel Corporation, ATmega32C1 Automotive Datasheet - Page 31

• Manufacturer Part Number: ATmega32C1 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega32C1 Automotive

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 27
• Ext Interrupts: 27
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Can: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• 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 150
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

5.3
5.4
7647G–AVR–09/11
Default Clock Source
Low Power Crystal Oscillator
Table 5-2.
The device is shipped with CKSEL = “0010”, SUT = “10”, and CKDIV8 programmed. The
default clock source setting is the Internal RC Oscillator with longest start-up time and an initial
system clock prescaling of 8. This default setting ensures that all users can make their desired
clock source setting using an In-System or Parallel programmer.
XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be
configured for use as an On-chip Oscillator, as shown in
a ceramic resonator may be used.
This Crystal Oscillator is a low power oscillator, with reduced voltage swing on the XTAL2 out-
put. It gives the lowest power consumption, but is not capable of driving other clock inputs.
C1 and C2 should always be equal for both crystals and resonators. The optimal value of the
capacitors depends on the crystal or resonator in use, the amount of stray capacitance, and
the electromagnetic noise of the environment. Some initial guidelines for choosing capacitors
for use with crystals are given in
by the manufacturer should be used. For more information on how to choose capacitors and
other details on Oscillator operation, refer to the Multi-purpose Oscillator Application Note.
Figure 5-2.
Typ Time-out (V
4.1 ms
65 ms
Number of Watchdog Oscillator Cycles
Crystal Oscillator Connections
CC
= 5.0V)
Table
Atmel ATmega16/32/64/M1/C1
Typ Time-out (V
5-3. For ceramic resonators, the capacitor values given
C2
C1
4.3 ms
69 ms
CC
= 3.0V)
Figure
XTAL2
XTAL1
GND
5-2. Either a quartz crystal or
Number of Cycles
64K (65,536)
4K (4,096)
31