ATMEGA64-16AJ Atmel, ATMEGA64-16AJ Datasheet - Page 37
![IC MCU AVR 64K 5V 16MHZ 64-TQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
ATMEGA64-16AJ
Manufacturer Part Number
ATMEGA64-16AJ
Description
IC MCU AVR 64K 5V 16MHZ 64-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA64-16AJ
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-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
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Price
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System Clock
and Clock
Options
Clock Systems
and their
Distribution
CPU Clock – clk
I/O Clock – clk
Flash Clock – clk
2490Q–AVR–06/10
I/O
CPU
FLASH
Figure 18
need not be active at a given time. In order to reduce power consumption, the clocks to modules
not being used can be halted by using different sleep modes, as described in
ment and Sleep Modes” on page
Figure 18. Clock Distribution
The CPU clock is routed to parts of the system concerned with operation of the AVR core.
Examples of such modules are the General Purpose Register File, the Status Register and the
data memory holding the Stack Pointer. Halting the CPU clock inhibits the core from performing
general operations and calculations.
The I/O clock is used by the majority of the I/O modules, like Timer/Counters, SPI, and USART.
The I/O clock is also used by the External Interrupt module, but note that some external inter-
rupts are detected by asynchronous logic, allowing such interrupts to be detected even if the I/O
clock is halted. Also note that address recognition in the TWI module is carried out asynchro-
nously when clk
The Flash clock controls operation of the Flash interface. The Flash clock is usually active simul-
taneously with the CPU clock.
Asynchronous
Timer/Counter
Timer/Counter
Oscillator
presents the principal clock systems in the AVR and their distribution. All of the clocks
I/O
is halted, enabling TWI address reception in all sleep modes.
External RC
General I/O
Oscillator
Modules
clk
clk
ASY
I/O
46. The clock systems are detailed below.
External Clock
Control Unit
AVR Clock
Multiplexer
Clock
ADC
clk
Source Clock
ADC
Reset Logic
CPU Core
clk
Oscillator
clk
Crystal
CPU
FLASH
Watchdog Clock
Watchdog Timer
Crystal Oscillator
Low-frequency
Watchdog
Oscillator
RAM
ATmega64(L)
Calibrated RC
“Power Manage-
Flash and
EEPROM
Oscillator
37
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