AT90S4434-8PC View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT90S4434-8PC
Atmel Corporation
AT90S4434-8PC Datasheet PDF : 10 Pages
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Block Diagram
VCC
GND
AVCC
AGND
AREF
PA0 - PA7
PC0 - PC7
PORTA DRIVERS
PORTC DRIVERS
DATA REGISTER
PORTA
DATA DIR.
REG. PORTA
DATA REGISTER
PORTC
8-BIT DATA BUS
DATA DIR.
REG. PORTC
ANALOG MUX
ADC
PROGRAM
COUNTER
PROGRAM
FLASH
INSTRUCTION
REGISTER
INSTRUCTION
DECODER
CONTROL
LINES
PROGRAMMING
LOGIC
STACK
POINTER
SRAM
GENERAL
PURPOSE
REGISTERS
X
Y
Z
ALU
STATUS
REGISTER
SPI
INTERNAL
OSCILLATOR
WATCHDOG
TIMER
MCU CONTROL
REGISTER
TIMER/
COUNTERS
INTERRUPT
UNIT
EEPROM
OSCILLATOR
OSCILLATOR
TIMING AND
CONTROL
UART
XTAL1
XTAL2
RESET
DATA REGISTER
PORTB
DATA DIR.
REG. PORTB
PORTB DRIVERS
DATA REGISTER
PORTD
DATA DIR.
REG. PORTD
PORTD DRIVERS
PB0 - PB7
The AVR core combines a rich instruction set with 32 gen-
eral 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
architecture is more code efficient while achieving through-
puts up to ten times faster than conventional CISC micro-
controllers.
The AT90S4434/8535 provides the following features:
4K/8K bytes of In-System Programmable Flash, 256/512
bytes EEPROM, 256/512 bytes SRAM, 32 general purpose
I/O lines, 32 general purpose working registers, RTC, three
flexible timer/counters with compare modes, internal and
PD0 - PD7
external interrupts, a programmable serial UART, 8-chan-
nel, 10-bit ADC, programmable Watchdog Timer with inter-
nal oscillator, an SPI serial port and three software
selectable power saving modes. The Idle mode stops the
CPU while allowing the SRAM, timer/counters, SPI port
and interrupt system to continue functioning. The Power
Down mode saves the register contents but freezes the
oscillator, disabling all other chip functions until the next
interrupt or hardware reset. In Power Save mode, the timer
oscillator continues to run, allowing the user to maintain a
timer base while the rest of the device is sleeping.
The device is manufactured using Atmel’s high density
non-volatile memory technology. The on-chip ISP Flash
2 AT90S/LS4434 and AT90S/LS8535
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