ATmega644P Automotive Atmel Corporation, ATmega644P Automotive Datasheet - Page 331

• Manufacturer Part Number: ATmega644P Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega644P Automotive

• Flash (kbytes): 64 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: 32
• Usb Speed: No
• Usb Interface: No
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• 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): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 125
• 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: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

26.3
Table 26-2.
26.3.1
26.3.2
7674F–AVR–09/09
Factory
Calibration
Clock Characteristics
External Clock Drive Waveforms
External Clock Drive
Calibration Accuracy of Internal RC Oscillator
Figure 26-2. External Clock Drive Waveforms
Table 26-3.
Note:
Symbol
1/t
t
t
t
t
t
CHCX
CLCX
CLCH
CHCL
CLCL
t
CLCL
CLCL
Frequency
8.0 MHz
1. Values indicated represent typical data from design simulation.
Parameter
Oscillator
Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period
from one clock
cycle to the next
External Clock Drive
V
IL1
V
IH1
2.7V - 5.5V
V
3V
CC
(1)
Min.
125
50
50
0
V
CC
=2.7-5.5V
Max.
1.6
1.6
8
2
ATmega164P/324P/644P
-40 C - 125 C
Temperature
25 C
Min.
62.5
25
25
0
V
CC
=4.5-5.5V
Max.
0.5
0.5
16
2
Calibration Accuracy
Units
±14%
MHz
±2%
ns
ns
ns
µs
µs
%
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