ATMEGA128A-ANR Atmel, ATMEGA128A-ANR Datasheet - Page 379

• 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

Table of Contents
8151H–AVR–02/11
1
2
3
4
5
6
7
8
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 2
Resources ................................................................................................. 8
Data Retention .......................................................................................... 8
About Code Examples ............................................................................. 8
AVR CPU Core .......................................................................................... 9
Memories ................................................................................................ 18
System Clock and Clock Options ......................................................... 37
2.1
2.2
2.3
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
7.1
7.2
7.3
7.4
7.5
7.6
8.1
8.2
8.3
8.4
8.5
8.6
8.7
Block Diagram ...................................................................................................3
ATmega103 and ATmega128A Compatibility ...................................................4
Pin Descriptions .................................................................................................5
Introduction ........................................................................................................9
Architectural Overview .......................................................................................9
ALU – Arithmetic Logic Unit .............................................................................10
Status Register ................................................................................................10
General Purpose Register File ........................................................................11
Stack Pointer ...................................................................................................13
Instruction Execution Timing ...........................................................................14
Reset and Interrupt Handling ...........................................................................15
In-System Reprogrammable Flash Program Memory .....................................18
SRAM Data Memory ........................................................................................19
EEPROM Data Memory ..................................................................................21
I/O Memory ......................................................................................................22
External Memory Interface ..............................................................................22
Register Description ........................................................................................30
Clock Systems and their Distribution ...............................................................37
Clock Sources .................................................................................................39
Default Clock Source .......................................................................................39
Crystal Oscillator .............................................................................................39
Low-frequency Crystal Oscillator .....................................................................41
External RC Oscillator .....................................................................................41
Calibrated Internal RC Oscillator .....................................................................42
ATmega128A
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