Datasheet AT90S2323, AT90LS2323, AT90S2343, AT90LS2343 (Atmel) - 2

Description 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 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
throughputs up to ten times faster than conventional CISC microcontrollers. Block Diagram Figure 1. The AT90S/LS2343 Block Diagram
VCC
8-BIT DATA BUS
INTERNAL
OSCILLATOR
GND
PROGRAM
COUNTER STACK
POINTER WATCHDOG
TIMER PROGRAM
FLASH SRAM MCU CONTROL
REGISTER INSTRUCTION
REGISTER INSTRUCTION
DECODER CONTROL
LINES TIMING AND
CONTROL RESET TIMER/
COUNTER GENERAL
PURPOSE
REGISTERS
X
Y
Z INTERRUPT
UNIT ALU EEPROM STATUS
REGISTER PROGRAMMING
LOGIC SPI DATA REGISTER
PORTB DATA DIR.
REG. PORTB PORTB DRIVERS PB0 -PB4 2 AT90S/LS2323/2343
1004D–09/01