ATMEGA128A-MUR Atmel, ATMEGA128A-MUR Datasheet - Page 12
![MCU AVR 128K FLASH 16MHZ 64QFN](/photos/12/13/121326/313-64-qfn_sml.jpg)
ATMEGA128A-MUR
Manufacturer Part Number
ATMEGA128A-MUR
Description
MCU AVR 128K FLASH 16MHZ 64QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA128A-MUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
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
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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6.5.1
8151H–AVR–02/11
X-register, Y-register, and Z-register
Figure 6-2 on page 12
CPU.
Figure 6-2.
Most of the instructions operating on the Register file have direct access to all registers, and
most of them are single cycle instructions.
As shown in
directly into the first 32 locations of the user Data Space. Although not being physically imple-
mented as SRAM locations, this memory organization provides great flexibility in access of the
registers, as the X-, Y-, and Z-pointer Registers can be set to index any register in the file.
The registers R26:R31 have some added functions to their general purpose usage. These regis-
ters are 16-bit address pointers for indirect addressing of the Data Space. The three indirect
address registers X, Y, and Z are described in
• One 8-bit output operand and one 8-bit result input
• Two 8-bit output operands and one 8-bit result input
• Two 8-bit output operands and one 16-bit result input
• One 16-bit output operand and one 16-bit result input
Registers
Purpose
Working
General
Figure
Atmel
6-2, each register is also assigned a data memory address, mapping them
®
AVR
shows the structure of the 32 general purpose working registers in the
®
CPU General Purpose Working Registers
7
R13
R14
R15
R16
R17
R26
R27
R28
R29
R30
R31
R0
R1
R2
…
…
Figure
0
6-3.
Addr.
$0D
$0E
$1A
$1B
$1C
$1D
$1E
$00
$01
$02
$0F
$10
$11
$1F
ATmega128A
X-register High Byte
Y-register High Byte
Z-register High Byte
X-register Low Byte
Y-register Low Byte
Z-register Low Byte
12
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