ATMEGA645-16AUR Atmel, ATMEGA645-16AUR Datasheet - Page 30
ATMEGA645-16AUR
Manufacturer Part Number
ATMEGA645-16AUR
Description
MCU AVR 64KB FLASH 16MHZ 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA325-16MU.pdf
(362 pages)
Specifications of ATMEGA645-16AUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
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8.6
2570M–AVR–04/11
External Clock
This clock may be selected as the system clock by programming the CKSEL Fuses as shown in
Table 8-7 on page
hardware loads the pre-programmed calibration value into the OSCCAL Register and thereby
automatically calibrates the RC Oscillator. The accuracy of this calibration is shown as Factory
calibration in
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 8-7.
Note:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 8-8 on page
Table 8-8.
Note:
To drive the device from an external clock source, XTAL1 should be driven as shown in
8-3 on page
to “0000” (see
Table 8-9.
Power Conditions
BOD enabled
Fast rising power
Slowly rising power
32, it is possible to get a higher calibration accuracy than by using the factory calibration.
1. The device is shipped with this option selected.
2. The frequency ranges are preliminary values. Actual values are TBD.
3. If 8MHz frequency exceeds the specification of the device (depends on V
The device is shipped with this option selected.
Fuse can be programmed in order to divide the internal frequency by 8.
31. To run the device on an external clock, the CKSEL Fuses must be programmed
Table 27-2 on page
Frequency Range
Internal Calibrated RC Oscillator Operating Modes
Start-up times for the internal calibrated RC Oscillator clock selection
Table 8-9 on page
Crystal Oscillator Clock Frequency
Frequency Range
30.
30. If selected, it will operate with no external components. During reset,
0 - 16MHz
7.3 - 8.1
Start-up Time from Power-
down and Power-save
“Calibration Byte” on page
(2)
300.
30).
(MHz)
Reserved
6 CK
6 CK
6 CK
ATmega325/3250/645/6450
“OSCCAL – Oscillator Calibration Register” on
Additional Delay from
Reset (V
268.
14CK + 65ms
14CK + 4.1ms
14CK
Table 27-2 on page
CC
(1)(3)
CKSEL3..0
CKSEL3..0
= 5.0V)
0000
0010
(Note:)
CC
SUT1..0
), the CKDIV8
00
01
10
11
300.
Figure
30
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