AT90S2313-4PC Atmel, AT90S2313-4PC Datasheet - Page 9

• Manufacturer Part Number: AT90S2313-4PC
• Description: IC MCU 2K 4MHZ UART LV 20DIP
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S2313-4PC

• 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: 15
• 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
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: SPI, UART
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 15
• Number Of Timers: 1 x 16 bit
• Operating Supply Voltage: 2.7 V to 6 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Lead Free Status / Rohs Status: No

SRAM Data Memory
0839I–AVR–06/02
Figure 8 shows how the AT90S2313 data memory is organized.
Figure 8. SRAM Organization
The 224 data memory locations address the Register File, I/O memory and the data
SRAM. The first 96 locations address the Register File + I/O memory, and the next 128
locations address the 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.
The Direct addressing reaches the entire data address space.
The Indirect with Displacement mode features 63 address locations reached from the
base address given by the Y- and Z-registers.
When using register indirect addressing modes with automatic pre-decrement and post-
increment, the address registers X, Y, and Z are used and decremented and
incremented.
The 32 general purpose working registers, 64 I/O Registers and the 128 bytes of data
SRAM in the AT90S2313 are all directly accessible through all these addressing modes.
I/O Registers
Register File
R29
R30
R31
$3D
$3E
$00
$01
$02
$3F
R0
R1
R2
…
…
Data Address Space
Internal SRAM
AT90S2313
$1D
$5D
$DD
$DE
$DF
$1E
$1F
$5E
$5F
$00
$01
$02
$20
$21
$22
$60
$61
$62
…
…
…
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