AT90LS2333-4AI Atmel, AT90LS2333-4AI Datasheet - Page 9

• Manufacturer Part Number: AT90LS2333-4AI
• Description: IC MCU 2K 4MHZ A/D LV IT 32TQFP
• Manufacturer: Atmel
• Series: AVR® 90LSr

Specifications of AT90LS2333-4AI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ALU - Arithmetic Logic Unit
The high-performance AVR ALU operates in direct connection with all the 32 general purpose working registers. Within a
single clock cycle, ALU operations between registers in the register file are executed. The ALU operations are divided into
three main categories - arithmetic, logical, and bit-functions.
In-System Programmable Flash Program Memory
The AT90S2333/4433 contains 2K/4K bytes on-chip In-System Programmable Flash memory for program storage. Since
all instructions are 16-or 32-bit words, the Flash is organized as 1K/2K x 16. The Flash memory has an endurance of at
least 1000 write/erase cycles. The AT90S2333/4433 Program Counter (PC) is 10/11 bits wide, thus addressing the
1024/2048 program memory addresses. See page 78 for a detailed description on Flash data downloading. See page 10
for the different program memory addressing modes.
Figure 9. SRAM Organization
SRAM Data Memory
The figure above shows how the AT90S2333/4433 SRAM Memory is organized.
The lower 224 Data Memory locations address the Register file, the I/O Memory and the internal data SRAM. The first 96
locations address the Register File and I/O Memory, and the next 128 locations address the internal data SRAM.
The five different addressing modes for the data memory cover: Direct, Indirect with Displacement, Indirect, Indirect with
Pre-Decrement, and Indirect with Post-Increment. In the register file, registers R26 to R31 feature the indirect addressing
pointer registers.
The direct addressing reaches the entire data space. The Indirect with Displacement mode features a 63 address locations
reach from the base address given by the Y or Z-register.
When using register indirect addressing modes with automatic pre-decrement and post-increment, the address registers X,
Y and Z are decremented and incremented.
I/O Registers
Register File
R29
R30
R31
$3D
$3E
$00
$01
$02
$3F
R0
R1
R2
…
AT90S/LS2333 and AT90S/LS4433
Data Address Space
Internal SRAM
$00DE
$00DF
$0000
$0001
$0002
$001D
$001E
$001F
$0020
$0021
$0022
$005D
$005E
$005F
$0060
$0061
…
9