ATMEGA128A-ANR Atmel, ATMEGA128A-ANR Datasheet - Page 20

• Manufacturer Part Number: ATMEGA128A-ANR
• Description: IC MCU AVR 128K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128A-ANR

• 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: 64-TQFP
• Core: AVR8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.2.1
8151H–AVR–02/11
Data Memory Access Times
The five different addressing modes for the data memory cover: Direct, Indirect with Displace-
ment, Indirect, Indirect with Pre-decrement, and Indirect with Post-increment. In the Register file,
registers R26 to R31 feature the indirect addressing pointer registers.
The direct addressing reaches the entire data space.
The Indirect with Displacement mode reaches 63 address locations from the base address given
by the Y- or Z-register.
When using register indirect addressing modes with automatic pre-decrement and post-incre-
ment, the address registers X, Y, and Z are decremented or incremented.
The 32 general purpose working registers, 64 I/O registers, and the 4096bytes of internal data
SRAM in the Atmel
The Register file is described in
Figure 7-2.
This section describes the general access timing concepts for internal memory access. The
internal data SRAM access is performed in two clk
Data Memory Map
Memory Configuration A
64 I/O Registers
160 Ext I/O Reg.
®
External SRAM
Internal SRAM
Data Memory
AVR
32 Registers
(0 - 64K x 8)
(4096 x 8)
®
ATmega128A are all accessible through all these addressing modes.
“General Purpose Register File” on page
$10FF
$1100
$FFFF
$0000 - $001F
$0020 - $005F
$0060 - $00FF
$0100
CPU
Memory Configuration B
cycles as described in
64 I/O Registers
External SRAM
Internal SRAM
Data Memory
32 Registers
(0 - 64K x 8)
(4000 x 8)
ATmega128A
$0FFF
$1000
$0000 - $001F
$0020 - $005F
$0060
$FFFF
11.
Figure
7-3.
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