ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 392

• Manufacturer Part Number: ATMEGA128RFA1-ZU
• Description: IC AVR MCU 2.4GHZ XCEIVER 64QFN
• Manufacturer: Atmel
• Series: ATMEGAr

Specifications of ATMEGA128RFA1-ZU

• 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
• Rf Ic Case Style: QFN
• No. Of Pins: 64
• Supply Voltage Range: 1.8V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• 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

392
ATmega128RFA1
Figure 25-13. Data Transfer in Master Receiver Mode
SDA
SCL
A START condition is sent by writing the following value to TWCR:
TWEN must be written to one to enable the 2-wire Serial Interface, TWSTA must be
written to one to transmit a START condition and TWINT must be set to clear the
TWINT Flag. The TWI will then test the 2-wire Serial Bus and generate a START
condition as soon as the bus becomes free. After a START condition has been
transmitted, the TWINT Flag is set by hardware, and the status code in TWSR will be
0x08 (see
transmitted. This is done by writing SLA+R to TWDR. Thereafter the TWINT bit should
be cleared (by writing it to one) to continue the transfer. This is accomplished by writing
the following value to TWCR:
When SLA+R have been transmitted and an acknowledgement bit has been received,
TWINT is set again and a number of status codes in TWSR are possible. Possible
status codes in Master mode are 0x38, 0x40, or 0x48. The appropriate action to be
taken for each of these status codes is detailed in
data can be read from the TWDR Register when the TWINT Flag is set high by
hardware. This scheme is repeated until the last byte has been received. After the last
byte has been received, the MR should inform the ST by sending a NACK after the last
received data byte. The transfer is ended by generating a STOP condition or a repeated
START condition. A STOP condition is generated by writing the following value to
TWCR:
A REPEATED START condition is generated by writing the following value to TWCR:
After a repeated START condition (state 0x10) the 2-wire Serial Interface can access
the same Slave again, or a new Slave without transmitting a STOP condition. Repeated
TWCR
Value
TWCR
Value
TWCR
value
TWCR
Value
Device 1
RECEIVER
MASTER
Table 25-4 on
TWINT
TWINT
TWINT
TWINT
1
1
1
1
TRANSMITTER
Device 2
TWEA
TWEA
TWEA
TWEA
SLAVE
X
X
X
X
page 393). In order to enter MR mode, SLA+R must be
TWSTA
TWSTA
TWSTA
TWSTA
Device 3
1
0
0
1
........
TWSTO
TWSTO
TWSTO
TWSTO
0
0
1
0
Device n
DEVDD
TWWC
TWWC
TWWC
TWWC
Table 25-4 on
X
X
X
X
R1
TWEN
TWEN
TWEN
TWEN
1
1
1
1
R2
page 393. Received
8266B-MCU Wireless-03/11
–
0
–
0
–
0
–
0
TWIE
TWIE
TWIE
TWIE
X
X
X
X