AT90S4433-8PC Atmel, AT90S4433-8PC Datasheet - Page 11

• Manufacturer Part Number: AT90S4433-8PC
• Description: IC MCU 4K FLSH 8MHZ A/D 28DIP
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S4433-8PC

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Data Converters: A/D 6x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ALU – Arithmetic Logic
Unit
In-System
Programmable Flash
Program Memory
SRAM Data Memory
1042H–AVR–04/03
In the different addressing modes, these address registers have functions as fixed dis-
placement, automatic increment and decrement (see the descriptions for the different
instructions).
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 regis-
ters in the Register File are executed. The ALU operations are divided into three main
categories: arithmetic, logical, and bit functions.
The AT90S4433 contains 4K bytes of On-chip, In-System Programmable Flash memory
for program storage. Since all instructions are 16- or 32-bit words, the Flash is orga-
nized as 2K x 16. The Flash memory has an endurance of at least 1,000 write/erase
cycles. The AT90S4433 Program Counter (PC) is 11 bits wide, thus addressing the
2,048 program memory addresses. See page 93 for a detailed description of Flash data
downloading. See page 12 for the different program memory addressing modes.
Figure 9. SRAM Organization
Figure 9 shows how the AT90S4433 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 mem-
ory, and the next 128 locations address the internal data SRAM.
The five different addressing modes for the data memory cover: Direct, Indirect with Dis-
placement, Indirect, Indirect with Pre-decrement, and Indirect with Post-increment. In
the Register File, registers R26 to R31 feature the indirect addressing pointer registers.
I/O Registers
Register File
R29
R30
R31
$3D
$00
$01
$02
$3E
$3F
R0
R1
R2
…
º
AT90S/LS4433
Data Address Space
Internal SRAM
$001D
$005D
$00DE
$00DF
$001E
$001F
$0020
$0021
$0022
$005E
$005F
$0060
$0061
$0000
$0001
$0002
…
º
º
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