AT90USB647 datasheet(6/456 Pages) ATMEL

6 / 456 page

7593L–AVR–09/12

AT90USB64/128

2.1

Block diagram

Figure 2-1.

Block diagram.

The AVR core combines a rich instruction set with 32 general purpose working registers. All the

32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent

registers to be accessed in one single instruction executed in one clock cycle. The resulting

PROGRAM

COUNTER

ST ACK

POINTER

PROGRAM

FLASH

MCU CONTROL

SRAM

GENERAL

PURPOSE

REGISTERS

INSTRUCTION

TIMER/

COUNTERS

INSTRUCTION

DECODER

DATA DIR.

REG. PORTB

DATA DIR.

REG. PORTE

DATA DIR.

REG. PORT A

DATA DIR.

REG. PORTD

DATA REGISTER

PORTB

DATA REGISTER

PORTE

DATA REGISTER

PORT A

DAT A REGISTER

PORTD

INTERRUPT

UNIT

EEPROM

SPI

USART1

ST ATUS

ALU

POR TB DRIVERS

POR TE DRIVERS

POR TA DRIVERS

POR TF DRIVERS

POR TD DRIVERS

POR TC DRIVERS

PB7 - PB0

PE7 - PE0

PA7 - P A0

PF7 - PF0

VCC

AGND

GND

AREF

CONTROL

LINES

PC7 - PC0

INTERNAL

OSCILLA TOR

WATCHDOG

TIMER

8-BIT DA TA BUS

AVCC

USB

TIMING AND

CONTROL

OSCILLA TOR

CALIB. OSC

DATA DIR.

REG. PORT C

DATA REGISTER

PORT C

ON-CHIP DEBUG

JTAG TAP

PROGRAMMING

LOGIC

BOUNDARY-

SCAN

DATA DIR.

REG. PORT F

DATA REGISTER

PORT F

ADC

POR - BOD

RESET

PD7 - PD0

TWO-WIRE SERIAL

INTERFACE

PLL

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