ATmega640 Atmel Corporation, ATmega640 Datasheet - Page 47
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ATmega640
Manufacturer Part Number
ATmega640
Description
Manufacturer
Atmel Corporation
Specifications of ATmega640
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
86
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
5
Twi (i2c)
1
Uart
4
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
16
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
8
Eeprom (bytes)
4096
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
6
Output Compare Channels
16
Input Capture Channels
4
Pwm Channels
15
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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10.8
2549N–AVR–05/11
128 kHz Internal Oscillator
This clock may be selected as the system clock by programming the CKSEL Fuses as shown in
Table
the pre-programmed calibration value into the OSCCAL Register and thereby automatically cal-
ibrates the RC Oscillator. The accuracy of this calibration is shown as Factory calibration in
Table 31-1 on page
By changing the OSCCAL register from SW, see
page
The accuracy of this calibration is shown as User calibration in
When this Oscillator is used as the 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 cali-
bration value, see the section
Table 10-9.
Notes:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 10-10. Start-up times for the internal calibrated RC Oscillator clock selection
Note:
The 128kHz internal Oscillator is a low power Oscillator providing a clock of 128kHz. The fre-
quency is nominal at 3V and 25°C. This clock may be select as the system clock by
programming the CKSEL Fuses to “11” as shown in
Table 10-11. 128kHz Internal Oscillator Operating Modes
Note:
Slowly rising power
Power Conditions
Fast rising power
50, it is possible to get a higher calibration accuracy than by using the factory calibration.
10-9. If selected, it will operate with no external components. During reset, hardware loads
10-10.
BOD enabled
1. The device is shipped with this option selected.
2. If 8MHz frequency exceeds the specification of the device (depends on V
1. The device is shipped with this option selected.
1. Note that the 128kHz oscillator is a very low power clock source, and is not designed for high
Fuse can be programmed in order to divide the internal frequency by 8.
accuracy.
Internal Calibrated RC Oscillator Operating Modes
Frequency Range (MHz)
Nominal Frequency
371.
7.3 - 8.1
128kHz
Start-up Time from Power-
“Calibration Byte” on page
down and Power-save
ATmega640/1280/1281/2560/2561
Reserved
6CK
6CK
6CK
“OSCCAL – Oscillator Calibration Register” on
Table
338.
10-11.
(1)
Additional Delay from
Table 31-1 on page
Reset (V
14CK + 65ms
(1)(2)
14CK + 4.1ms
14CK
CC
CKSEL3:0
CKSEL3:0
= 5.0V)
0010
0011
CC
(1)
), the CKDIV8
371.
SUT1:0
00
01
10
11
47
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