ATMEGA8535-16AUR Atmel, ATMEGA8535-16AUR Datasheet - Page 202
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ATMEGA8535-16AUR
Manufacturer Part Number
ATMEGA8535-16AUR
Description
MCU AVR 8K FLASH 16MHZ 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8535L-8AU.pdf
(321 pages)
Specifications of ATMEGA8535-16AUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
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)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
Quantity
Price
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ATmega8535(L)
Several different scenarios may arise during arbitration, as described below:
•
•
•
This is summarized in Figure 96. Possible status values are given in circles.
Figure 96. Possible Status Codes Caused by Arbitration
START
Two or more masters are performing identical communication with the same Slave.
In this case, neither the Slave nor any of the masters will know about the bus
contention.
Two or more masters are accessing the same Slave with different data or direction
bit. In this case, arbitration will occur, either in the READ/WRITE bit or in the data
bits. The masters trying to output a one on SDA while another Master outputs a zero
will lose the arbitration. Losing masters will switch to not addressed Slave mode or
wait until the bus is free and transmit a new START condition, depending on
application software action.
Two or more masters are accessing different slaves. In this case, arbitration will
occur in the SLA bits. Masters trying to output a one on SDA while another Master
outputs a zero will lose the arbitration. Masters losing arbitration in SLA will switch to
Slave mode to check if they are being addressed by the winning Master. If
addressed, they will switch to SR or ST mode, depending on the value of the
READ/WRITE bit. If they are not being addressed, they will switch to not addressed
Slave mode or wait until the bus is free and transmit a new START condition,
depending on application software action.
Address / General Call
received
Direction
Own
Yes
Arbitration lost in SLA
SLA
Write
Read
No
68/78
38
B0
Arbitration lost in Data
TWI bus will be released and not addressed slave mode will be entered
A START condition will be transmitted when the bus becomes free
Data byte will be received and NOT ACK will be returned
Data byte will be received and ACK will be returned
Last data byte will be transmitted and NOT ACK should be received
Data byte will be transmitted and ACK should be received
Data
2502K–AVR–10/06
STOP
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