ATMEGA8515-16MJ Atmel, ATMEGA8515-16MJ Datasheet - Page 34
ATMEGA8515-16MJ
Manufacturer Part Number
ATMEGA8515-16MJ
Description
IC MCU AVR 8K 5V 16MHZ 44-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8515-16MJ
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
35
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-VQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
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System Clock and
Clock Options
Clock Systems and their
Distribution
CPU Clock – clk
I/O Clock – clk
34
ATmega8515(L)
I/O
CPU
Figure 18 presents the principal clock systems in the AVR and their distribution. All of
the clocks 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 “Power Management and Sleep Modes” on page 41. The clock systems
are detailed below.
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 Reg-
ister, 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 interrupts are detected by asynchronous logic, allowing such interrupts to be
detected even if the I/O clock is halted.
External RC
General I/O
Oscillator
Modules
clk
I/O
External Clock
Control Unit
AVR Clock
Multiplexer
Clock
Source clock
CPU Core
clk
Oscillator
clk
Crystal
Reset Logic
CPU
FLASH
Watchdog clock
Crystal Oscillator
Low-frequency
Watchdog Timer
RAM
Watchdog
Oscillator
Calibrated RC
2512K–AVR–01/10
Flash and
EEPROM
Oscillator
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