AT90LS4434-4AI ATMEL Corporation, AT90LS4434-4AI Datasheet - Page 4

• Manufacturer Part Number: AT90LS4434-4AI
• Description: 8-Bit Microcontroller with 4K/8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

Figure 1. Oscillator Connections
Architectural Overview
The fast-access register file concept contains 32 x 8-bit
general purpose working registers with a single clock cycle
access time. This means that during one single clock cycle,
one Arithmetic Logic Unit (ALU) operation is executed. Two
operands are output from the register file, the operation is
executed, and the result is stored back in the register file -
in one clock cycle.
Figure 3. The AT90S4434/8535 AVR Enhanced RISC Architecture
4
AT90S/LS4434 and AT90S/LS8535
Control Lines
2K/4K X 16
Instruction
Instruction
Program
Decoder
Memory
Register
AVR AT90S4434/8535 Architecture
Program
Counter
Figure 2. External Clock Drive Configuration
Six of the 32 registers can be used as three 16-bits indirect
address register pointers for Data Space addressing -
enabling efficient address calculations. One of the three
address pointers is also used as the address pointer for the
constant table look up function. These added function reg-
isters are the 16-bits X-register, Y-register and Z-register.
and Control
256/512 x 8
256/512 x 8
Registrers
EEPROM
I/O Lines
Purpose
General
Data Bus 8-bit
SRAM
Status
32 x 8
ALU
Data
32
Analog to Digital
Timer/Counter
Timer/Counter
Timer/Counter
Comparator
with PWM
with PWM
Watchdog
Converter
Interrupt
Analog
Serial
UART
16-bit
Timer
8-bit
8-bit
Unit
SPI
Unit