ATmega644P Atmel Corporation, ATmega644P Datasheet - Page 333

• Manufacturer Part Number: ATmega644P
• Manufacturer: Atmel Corporation

Specifications of ATmega644P

• Flash (kbytes): 64 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 20 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 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 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

25.7
Table 25-10
wire Serial Interface meets or exceeds these requirements under the noted conditions.
Timing symbols refer to
Table 25-10. 2-wire Serial Bus Requirements
8011O–AVR–07/10
Symbol
V
V
V
V
t
t
t
I
C
f
Rp
r
of
SP
i
SCL
(1)
IL
IH
hys
OL
i
(1)
(1)
(1)
(1)
(1)
2-wire Serial Interface Characteristics
Parameter
Input Low-voltage
Input High-voltage
Hysteresis of Schmitt Trigger Inputs
Output Low-voltage
Rise Time for both SDA and SCL
Output Fall Time from V
Spikes Suppressed by Input Filter
Input Current each I/O Pin
Capacitance for each I/O Pin
SCL Clock Frequency
Value of Pull-up resistor
describes the requirements for devices connected to the 2-wire Serial Bus. The ATmega164P/324P/644P 2-
Figure
Figure 25-5. SPI Interface Timing Requirements (Slave Mode)
25-6.
(Data Output)
IHmin
(Data Input)
(CPOL = 0)
(CPOL = 1)
to V
MOSI
MISO
SCK
SCK
SS
ILmax
9
13
f
MSB
CK
MSB
(4)
14
10 pF < C
0.1V
> max(16f
3 mA sink current
f
f
SCL
SCL
CC
15
Condition
< V
≤ 100 kHz
> 100 kHz
b
< 400 pF
SCL
i
< 0.9V
, 250kHz)
CC
ATmega164P/324P/644P
...
...
(3)
(5)
20 + 0.1C
20 + 0.1C
V
----------------------------
V
----------------------------
0.05V
CC
CC
0.7V
3 mA
3 mA
11
-0.5
Min
-10
–
–
0
0
–
0
0.4V
0.4V
CC
CC
b
b
(2)
(2)(3)
(2)(3)
10
LSB
LSB
11
V
12
1000 ns
-------------------- -
0.3V
CC
300 ns
----------------- -
50
Max
300
250
400
0.4
C
10
10
C
16
–
+ 0.5
b
(2)
b
CC
X
17
Units
kHz
µA
pF
ns
Ω
V
333