ATMEGA8535L-8PC Atmel, ATMEGA8535L-8PC Datasheet - Page 13
![IC AVR MCU 8K LV 8MHZ COM 40-DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA8535L-8PC
Manufacturer Part Number
ATMEGA8535L-8PC
Description
IC AVR MCU 8K LV 8MHZ COM 40-DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8535L-8PC
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, 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 ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Instruction Execution
Timing
Reset and Interrupt
Handling
2502K–AVR–10/06
This section describes the general access timing concepts for instruction execution. The
AVR CPU is driven by the CPU clock clk
source for the chip. No internal clock division is used.
Figure 6 shows the parallel instruction fetches and instruction executions enabled by the
Harvard architecture and the fast-access Register File concept. This is the basic pipelin-
ing concept to obtain up to 1 MIPS per MHz with the corresponding unique results for
functions per cost, functions per clocks, and functions per power-unit.
Figure 6. The Parallel Instruction Fetches and Instruction Executions
Figure 7 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 7. Single Cycle ALU Operation
The AVR provides several different interrupt sources. These interrupts and the separate
Reset Vector each have a separate Program Vector in the program memory space. All
interrupts are assigned individual enable bits which must be written logic one together
with the Global Interrupt Enable bit in the Status Register in order to enable the interrupt.
Depending on the Program Counter value, interrupts may be automatically disabled
when Boot Lock bits BLB02 or BLB12 are programmed. This feature improves software
security. See the section “Memory Programming” on page 237 for details.
The lowest addresses in the program memory space are, by default, defined as the
Reset and Interrupt Vectors. The complete list of vectors is shown in “Interrupts” on
page 46. The list also determines the priority levels of the different interrupts. The lower
the address, the higher the priority level is. RESET has the highest priority, and next is
INT0 – the External Interrupt Request 0. The Interrupt Vectors can be moved to the start
of the Boot Flash section by setting the IVSEL bit in the General Interrupt Control Regis-
ter (GICR). Refer to “Interrupts” on page 46 for more information. The Reset Vector can
Register Operands Fetch
2nd Instruction Execute
3rd Instruction Execute
ALU Operation Execute
1st Instruction Execute
2nd Instruction Fetch
3rd Instruction Fetch
4th Instruction Fetch
1st Instruction Fetch
Total Execution Time
Result Write Back
clk
clk
CPU
CPU
T1
T1
CPU
, directly generated from the selected clock
T2
T2
ATmega8535(L)
T3
T3
T4
T4
13
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