ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 400

• 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

25.7.5 Miscellaneous States
Table 25-7. Miscellaneous States
25.7.6 Combining Several TWI Modes
400
0xF8
0x00
Status Code
Prescaler
Bits are 0
(TWSR)
ATmega128RFA1
No relevant state
information available
Bus error due to an illegal
START or STOP condition
Serial Bus and 2-wire
Serial Interface Hard-
Status of the 2-wire
ware
Figure 25-18. Formats and States in the Slave Transmitter Mode
Reception of the own
slave address and one or
more data bytes
Arbitration lost as master
and addressed as slave
Last data byte transmitted.
Switched to not addressed
slave (TWEA = ’0’)
There are two status codes that do not correspond to a defined TWI state, see
25-7
Status 0xF8 indicates that no relevant information is available because the TWINT Flag
is not set. This occurs between other states, and when the TWI is not involved in a
serial transfer.
Status 0x00 indicates that a bus error has occurred during a 2-wire Serial Bus transfer.
A bus error occurs when a START or STOP condition occurs at an illegal position in the
format frame. Examples of such illegal positions are during the serial transfer of an
address byte, a data byte, or an acknowledge bit. When a bus error occurs, TWINT is
set. To recover from a bus error, the TWSTO Flag must set and TWINT must be
cleared by writing a logic one to it. This causes the TWI to enter the not addressed
Slave mode and to clear the TWSTO Flag (no other bits in TWCR are affected). The
SDA and SCL lines are released, and no STOP condition is transmitted.
In some cases, several TWI modes must be combined in order to complete the desired
action. Consider for example reading data from a serial EEPROM. Typically, such a
transfer involves the following steps:
1. The transfer must be initiated.
2. The EEPROM must be instructed what location should be read.
below.
To/from TWDR
TWDR action
No TWDR action
From master to slave
From slave to master
Application Software Response
S
SLA
No TWCR action
STA
0
R
DATA
STO
1
To TWCR
$A8
$B0
A
A
n
TWINT
1
A
DATA
Any number of data bytes
and their associated acknowledge bits
This number (contained in TWSR) corresponds
to a defined state of the Two-Wire Serial Bus. The
prescaler bits are zero or masked to zero
TWEA
X
$B8
A
Next Action Taken by TWI
Hardware
Wait or proceed current transfer
Only the internal hardware is
affected, no STOP condi-tion is sent
on the bus. In all cases, the bus is
released and TWSTO is cleared.
DATA
8266B-MCU Wireless-03/11
$C0
$C8
A
A
P or S
All 1’s
P or S
Table