AT90LS8535-4PI Atmel, AT90LS8535-4PI Datasheet - Page 11
![IC MCU 8K 4MHZ A/D LV IT 40DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
AT90LS8535-4PI
Manufacturer Part Number
AT90LS8535-4PI
Description
IC MCU 8K 4MHZ A/D LV IT 40DIP
Manufacturer
Atmel
Series
AVR® 90LSr
Specifications of AT90LS8535-4PI
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
32
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 6 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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SRAM Data Memory
1041H–11/01
Figure 8 shows how the AT90S8535 SRAM memory is organized.
Figure 8. SRAM Organization
The lower 608 data memory locations address the Register file, the I/O memory and the
internal data SRAM. The first 96 locations address the Register file + I/O memory, and
the next 512 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.
The direct addressing reaches the entire data space.
The Indirect with Displacement mode features 63 address locations reached from the
base address given by the Y- or Z-registers.
When using register indirect addressing modes with automatic pre-decrement and post-
increment, the address registers X, Y, and Z are decremented and incremented.
The 32 general-purpose working registers, 64 I/O registers and the 512 bytes of internal
data SRAM in the AT90S8535 are all accessible through all these addressing modes.
See the next section for a detailed description of the different addressing modes.
I/O Registers
Register File
R29
R30
$3D
R31
$3E
$3F
$00
$01
$02
R0
R1
R2
...
...
AT90S/LS8535
Data Address Space
Internal SRAM
$001D
$001E
$005D
$005E
$005F
$025E
$025F
$0000
$0001
$0002
$001F
$0020
$0021
$0022
$0060
$0061
...
...
...
11
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