ATMEGA64-16MJ Atmel, ATMEGA64-16MJ Datasheet - Page 44
ATMEGA64-16MJ
Manufacturer Part Number
ATMEGA64-16MJ
Description
IC MCU AVR 64K 5V 16MHZ 64-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA64-16MJ
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
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)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-MLF®, 64-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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External Clock
2490Q–AVR–06/10
non-zero values to this register will increase the frequency of the internal Oscillator. Writing
0xFF to the register gives the highest available frequency. The calibrated Oscillator is used to
time EEPROM and Flash access. If EEPROM or Flash is written, do not calibrate to more than
10% above the nominal frequency. Otherwise, the EEPROM or Flash write may fail. Note that
the Oscillator is intended for calibration to 1.0 MHz, 2.0 MHz, 4.0 MHz, or 8.0 MHz. Tuning to
other values is not guaranteed, as indicated in
Table 15. Internal RC Oscillator Frequency Range
To drive the device from an external clock source, XTAL1 should be driven as shown in
21. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.
By programming the CKOPT Fuse, the user can enable an internal 36 pF capacitor between
XTAL1 and GND.
Figure 21. External Clock Drive Configuration
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 16. Start-up Times for the External Clock Selection
When applying an external clock, it is required to avoid sudden changes in the applied clock fre-
quency to ensure stable operation of the MCU. A variation in frequency of more than 2% from
one clock cycle to the next can lead to unpredictable behavior. It is required to ensure that the
MCU is kept in Reset during such changes in the clock frequency.
SUT1..0
OSCCAL Value
00
01
10
11
0xFF
16.
0x00
0x7F
Start-up Time from Power-
down and Power-save
Min Frequency in Percentage of
6 CK
6 CK
6 CK
Nominal Frequency (%)
100
EXTERNAL
50
75
SIGNAL
CLOCK
Additional Delay from
Reset (V
Reserved
Table
4.1 ms
65 ms
CC
–
15.
= 5.0 V)
Max Frequency in Percentage of
Nominal Frequency (%)
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
100
150
200
ATmega64(L)
Figure
44
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