AT90LS2343 ATMEL [ATMEL Corporation], AT90LS2343 Datasheet - Page 2

• Manufacturer Part Number: AT90LS2343
• Description: 8-Bit Microcontroller with 2K Bytes of In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Description
Block Diagram
2
AT90S/LS2323/2343
The AT90S/LS2323 and AT90S/LS2343 are low-power, CMOS, 8-bit microcontrollers
based on the AVR RISC architecture. By executing powerful instructions in a single
clock cycle, the AT90S2323/2343 achieves throughputs approaching 1 MIPS per MHz
allowing the system designer to optimize power consumption versus processing speed.
The AVR core combines a rich instruction set with 32 general-purpose working regis-
ters. 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
throughputs up to ten times faster than conventional CISC microcontrollers.
Figure 1. The AT90S/LS2343 Block Diagram
VCC
GND
PROGRAMMING
INSTRUCTION
INSTRUCTION
PROGRAM
PROGRAM
REGISTER
COUNTER
CONTROL
DECODER
FLASH
LOGIC
LINES
REGISTERS
REGISTER
GENERAL
PURPOSE
POINTER
STATUS
STACK
SRAM
DATA REGISTER
ALU
SPI
X
Y
Z
PORTB
8-BIT DATA BUS
PORTB DRIVERS
PB0 - PB4
REG. PORTB
DATA DIR.
MCU CONTROL
OSCILLATOR
WATCHDOG
INTERRUPT
REGISTER
INTERNAL
COUNTER
EEPROM
TIMER/
TIMER
UNIT
TIMING AND
CONTROL
1004D–09/01
RESET