AT90LS8535-4MI Atmel, AT90LS8535-4MI Datasheet - Page 16

• Manufacturer Part Number: AT90LS8535-4MI
• Description: IC MCU 8K FLASH 4MHZ IND 44-QFN
• Manufacturer: Atmel
• Series: AVR® 90LSr

Specifications of AT90LS8535-4MI

• 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: 44-VQFN Exposed Pad
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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AT90S/LS8535
Figure 20. The Parallel Instruction Fetches and Instruction Executions
Figure 21 shows the internal timing concept for the register file. In a single clock cycle
an ALU operation using two register operands is executed and the result is stored back
to the destination register.
Figure 21. Single Cycle ALU Operation
The internal data SRAM access is performed in two System Clock cycles as described
in Figure 22.
Figure 22. On-chip Data SRAM Access Cycles
System Clock Ø
2nd Instruction Execute
Register Operands Fetch
3rd Instruction Execute
1st Instruction Execute
ALU Operation Execute
2nd Instruction Fetch
3rd Instruction Fetch
4th Instruction Fetch
1st Instruction Fetch
Total Execution Time
Result Write Back
System Clock Ø
Address
System Clock Ø
Data
Data
WR
RD
Prev. Address
T1
T1
T1
Address
T2
T2
T2
T3
T3
T3
T4
1041H–11/01
T4
T4