ATMEGA8A-AUR Atmel, ATMEGA8A-AUR Datasheet - Page 24
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ATMEGA8A-AUR
Manufacturer Part Number
ATMEGA8A-AUR
Description
MCU AVR 8KB FLASH 16MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8A-MU.pdf
(308 pages)
Specifications of ATMEGA8A-AUR
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
23
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K 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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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8. System Clock and Clock Options
8.1
8.1.1
8.1.2
8159D–AVR–02/11
Clock Systems and their Distribution
CPU Clock – clk
I/O Clock – clk
I/O
Figure 8-1
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 8-1.
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
CPU
Timer/Counter
Timer/Counter
Asynchronous
Oscillator
presents the principal clock systems in the AVR and their distribution. All of the clocks
Clock Distribution
I/O
is halted, enabling TWI address reception in all sleep modes.
General I/O
External RC
Modules
Oscillator
clk
clk
ASY
I/O
32. The clock systems are detailed
External Clock
Control Unit
AVR Clock
Multiplexer
Clock
ADC
clk
Source Clock
ADC
CPU Core
Reset Logic
clk
Oscillator
clk
Crystal
CPU
FLASH
Watchdog Clock
Crystal Oscillator
Low-Frequency
Watchdog Timer
Figure
Watchdog
Oscillator
RAM
ATmega8A
8-1.
“Power Manage-
Calibrated RC
Flash and
EEPROM
Oscillator
24
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