ATMEGA128RFA1-ZUR Atmel, ATMEGA128RFA1-ZUR Datasheet - Page 380
ATMEGA128RFA1-ZUR
Manufacturer Part Number
ATMEGA128RFA1-ZUR
Description
IC AVR MCU 2.4GHZ XCEIVER 64QFN
Manufacturer
Atmel
Series
ATMEGAr
Datasheets
1.ATMEGA128-16AU.pdf
(385 pages)
2.ATAVR128RFA1-EK1.pdf
(13 pages)
3.ATAVR128RFA1-EK1.pdf
(555 pages)
Specifications of ATMEGA128RFA1-ZUR
Frequency
2.4GHz
Data Rate - Maximum
2Mbps
Modulation Or Protocol
802.15.4 Zigbee
Applications
General Purpose
Power - Output
3.5dBm
Sensitivity
-100dBm
Voltage - Supply
1.8 V ~ 3.6 V
Current - Receiving
12.5mA
Current - Transmitting
14.5mA
Data Interface
PCB, Surface Mount
Memory Size
128kB Flash, 4kB EEPROM, 16kB RAM
Antenna Connector
PCB, Surface Mount
Operating Temperature
-40°C ~ 85°C
Package / Case
64-VFQFN, Exposed Pad
Processor Series
ATMEGA128x
Core
AVR8
Data Bus Width
8 bit
Program Memory Type
Flash
Program Memory Size
128 KB
Data Ram Size
16 KB
Interface Type
JTAG
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
38
Number Of Timers
6
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVR128RFA1-EK1
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA128RFA1-ZUR
Manufacturer:
ON
Quantity:
56 000
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25.3.3 Address Packet Format
25.3.4 Data Packet Format
380
ATmega128RFA1
Figure 25-3. START, REPEATED START and STOP conditions
SDA
All address packets transmitted on the TWI bus are 9 bits long, consisting of 7 address
bits, one READ/WRITE control bit and an acknowledge bit. If the READ/WRITE bit is
set, a read operation is to be performed, otherwise a write operation should be
performed. When a Slave recognizes that it is being addressed, it should acknowledge
by pulling SDA low in the ninth SCL (ACK) cycle. If the addressed Slave is busy, or for
some other reason can not service the Master’s request, the SDA line should be left
high in the ACK clock cycle. The Master can then transmit a STOP condition, or a
REPEATED START condition to initiate a new transmission. An address packet
consisting of a slave address and a READ or a WRITE bit is called SLA+R or SLA+W,
respectively.
The MSB of the address byte is transmitted first. Slave addresses can freely be
allocated by the designer, but the address 0000 000 is reserved for a general call.
When a general call is issued, all slaves should respond by pulling the SDA line low in
the ACK cycle. A general call is used when a Master wishes to transmit the same
message to several slaves in the system. When the general call address followed by a
Write bit is transmitted on the bus, all slaves set up to acknowledge the general call will
pull the SDA line low in the ack cycle. The following data packets will then be received
by all the slaves that acknowledged the general call. Note that transmitting the general
call address followed by a Read bit is meaningless, as this would cause contention if
several slaves started transmitting different data.
All addresses of the format 1111 xxx should be reserved for future purposes.
Figure 25-4. Address Packet Format
SDA
All data packets transmitted on the TWI bus are nine bits long, consisting of one data
byte and an acknowledge bit. During a data transfer, the Master generates the clock
and the START and STOP conditions, while the Receiver is responsible for
acknowledging the reception. An Acknowledge (ACK) is signaled by the Receiver
SCL
SCL
START
START
Addr MSB
1
STOP
2
START
Addr LSB
7
REPEATED START
R/W
8
ACK
9
8266B-MCU Wireless-03/11
STOP
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