ATMEGA128L-8MI Atmel, ATMEGA128L-8MI Datasheet - Page 9
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ATMEGA128L-8MI
Manufacturer Part Number
ATMEGA128L-8MI
Description
IC AVR MCU 128K LV 8MHZ IND64QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA128L-8MI
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
4K 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
64-MLF®, 64-QFN
For Use With
ATSTK501 - ADAPTER KIT FOR 64PIN AVR MCU
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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AVR CPU Core
Introduction
Architectural
Overview
2467V–AVR–02/11
This section discusses the Atmel
CPU core is to ensure correct program execution. The CPU must therefore be able to access
memories, perform calculations, control peripherals and handle interrupts.
Figure 3. Block Diagram of the AVR Architecture
In order to maximize performance and parallelism, the AVR uses a Harvard architecture – with
separate memories and buses for program and data. Instructions in the program memory are
executed with a single level pipelining. While one instruction is being executed, the next instruc-
tion is pre-fetched from the program memory. This concept enables instructions to be executed
in every clock cycle. The program memory is In-System Reprogrammable Flash memory.
The fast-access Register file contains 32 x 8-bit general purpose working registers with a single
clock cycle access time. This allows single-cycle Arithmetic Logic Unit (ALU) operation. In a typ-
ical ALU operation, two operands are output from the Register file, the operation is executed,
and the result is stored back in the Register file – in one clock cycle.
Six of the 32 registers can be used as three 16-bit indirect address register pointers for Data
Space addressing – enabling efficient address calculations. One of the these address pointers
can also be used as an address pointer for look up tables in Flash Program memory. These
added function registers are the 16-bit X-register, Y-register and Z-register, described later in
this section.
The ALU supports arithmetic and logic operations between registers or between a constant and
a register. Single register operations can also be executed in the ALU. After an arithmetic opera-
tion, the Status Register is updated to reflect information about the result of the operation.
Control Lines
Instruction
Instruction
Program
Memory
Register
Decoder
Flash
®
AVR
Program
Counter
®
core architecture in general. The main function of the
and Control
EEPROM
Registrers
I/O Lines
Purpose
General
SRAM
Data Bus 8-bit
Status
32 x 8
Data
ALU
I/O Module1
I/O Module 2
Comparator
I/O Module n
Watchdog
ATmega128
Interrupt
Timer
Analog
Unit
Unit
SPI
9
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