ATmega6490 Atmel Corporation, ATmega6490 Datasheet - Page 29
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ATmega6490
Manufacturer Part Number
ATmega6490
Description
Manufacturer
Atmel Corporation
Specifications of ATmega6490
Flash (kbytes)
64 Kbytes
Pin Count
100
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
69
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Segment Lcd
160
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
No
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
4
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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8.4
8.5
2552K–AVR–04/11
Low-frequency Crystal Oscillator
Calibrated Internal RC Oscillator
Table 8-4.
Note:
To use a 32.768kHz watch crystal as the clock source for the device, the low-frequency crystal
Oscillator must be selected by setting the CKSEL Fuses to “0110” or “0111”. The crystal should
be connected as shown in
mined by the SUT Fuses as shown in
Table 8-5.
Table 8-6.
Note:
The calibrated Internal RC Oscillator by default provides a 8.0MHz clock. The frequency is nom-
inal value at 3V and 25°C. The device is shipped with the CKDIV8 Fuse programmed. See
“System Clock Prescaler” on page 32
CKSEL0
CKSEL3..0
SUT1..0
0110
00
01
10
11
0111
0
1
1
1
1
(1)
1. These options should only be used when not operating close to the maximum frequency of the
2. These options are intended for use with ceramic resonators and will ensure frequency stability
1. This option should only be used if frequency stability at start-up is not important for the
device, and only if frequency stability at start-up is not important for the application. These
options are not suitable for crystals.
at start-up. They can also be used with crystals when not operating close to the maximum fre-
quency of the device, and if frequency stability at start-up is not important for the application.
application
SUT1..0
Additional Delay from Reset (V
Start-up Times for the Crystal Oscillator Clock Selection (Continued)
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
11
00
01
10
11
Power-down and Power-save
Start-up Time from
Power-down and
14CK + 4.1ms
14CK + 65ms
Power-save
Figure
Start-up Time from
1K CK
1K CK
16K CK
16K CK
16K CK
14CK
32K CK
1K CK
8-2. When this Oscillator is selected, start-up times are deter-
(2)
(2)
Table 8-5
for more details.
CC
Reserved
ATmega329/3290/649/6490
= 5.0V)
Additional Delay
14CK + 4.1ms
14CK + 4.1ms
14CK + 65ms
14CK + 65ms
and CKSEL1..0 as shown in
(V
from Reset
CC
14CK
= 5.0V)
Recommended Usage
Fast rising power or BOD enabled
Slowly rising power
Stable frequency at start-up
Recommended Usage
Stable frequency at start-up
Recommended
Usage
Ceramic resonator,
fast rising power
Ceramic resonator,
slowly rising power
Crystal Oscillator,
BOD enabled
Crystal Oscillator, fast
rising power
Crystal Oscillator,
slowly rising power
Table
8-6.
29