ATmega256RZAV Atmel Corporation, ATmega256RZAV Datasheet - Page 246
ATmega256RZAV
Manufacturer Part Number
ATmega256RZAV
Description
Manufacturer
Atmel Corporation
Specifications of ATmega256RZAV
Flash (kbytes)
256 Kbytes
Max. Operating Frequency
16 MHz
Max I/o Pins
54
Spi
3
Twi (i2c)
1
Uart
2
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Crypto Engine
No
Sram (kbytes)
8
Eeprom (bytes)
4096
Operating Voltage (vcc)
1.8 to 3.6
Timers
6
Frequency Band
2.4 GHz
Max Data Rate (mb/s)
0.25
Antenna Diversity
No
External Pa Control
No
Power Output (dbm)
3
Receiver Sensitivity (dbm)
-101
Receive Current Consumption (ma)
16.0
Transmit Current Consumption (ma)
17.0
Link Budget (dbm)
104
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATmega256RZAV-8MU
Manufacturer:
Atmel
Quantity:
135
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24.5
2549N–AVR–05/11
Overview of the TWI Module
Figure 24-8. Arbitration Between Two Masters
Note that arbitration is not allowed between:
•
•
•
It is the user software’s responsibility to ensure that these illegal arbitration conditions never
occur. This implies that in multi-master systems, all data transfers must use the same composi-
tion of SLA+R/W and data packets. In other words: All transmissions must contain the same
number of data packets, otherwise the result of the arbitration is undefined.
The TWI module is comprised of several submodules, as shown in
registers drawn in a thick line are accessible through the AVR data bus.
A REPEATED START condition and a data bit
A STOP condition and a data bit
A REPEATED START and a STOP condition
Synchronized
SCL Line
SDA from
SDA from
Master A
Master B
SDA Line
START
ATmega640/1280/1281/2560/2561
Arbitration, SDA
Master A Loses
Figure 24-9 on page
A
SDA
247. All
246
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