ATmega128A Atmel Corporation, ATmega128A Datasheet - Page 379

• Manufacturer Part Number: ATmega128A
• Manufacturer: Atmel Corporation

Specifications of ATmega128A

• Flash (kbytes): 128 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 4096
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

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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