ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 365

• 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

23.10.12 UBRR1L – USART1 Baud Rate Register Low Byte
23.11 Examples of Baud Rate Setting
Table 23-14. Examples of UBRRn Settings for Commonly Used Oscillator Frequencies
8266A-MCU Wireless-12/09
Baud
Rate
(bps)
2400
4800
9600
14.4k
19.2k
28.8k
38.4k
f
U2Xn = 0
UBRR
47
23
11
7
5
3
2
OSC
= 1.8432 MHz
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
U2Xn = 1
UBRR
95
47
23
15
11
7
5
• Bit 3:0 – UBRR11:8 - USART Baud Rate Register
These bits represent bits [11:8] of the Baud Rate Register. Sample values for
commonly used clock frequencies can be found in section "Examples of Baud Rate
Setting".
UBRR1 is a 12-bit register which contains the USART baud rate. The UBRR1H
contains the four most significant bits, and the UBRR1L contains the eight least
significant bits of the USART baud rate. Ongoing transmissions by the Transmitter and
Receiver will be corrupted if the baud rate is changed. Writing UBRR1L will trigger an
immediate update of the baud rate prescaler.
• Bit 7:0 – UBRR7:0 - USART Baud Rate Register
These bits represent bits [7:0] of the Baud Rate Register. Sample values for commonly
used clock frequencies can be found in section "Examples of Baud Rate Setting".
For standard crystal and resonator frequencies, the most commonly used baud rates for
asynchronous operation can be generated by using the UBRR settings in
below
differing less than 0.5% from the target baud rate, are bold in the table. Higher error
ratings are acceptable, but the Receiver will have less noise resistance when the error
ratings are high, especially for large serial frames (see
Range" on page
Bit
NA ($CC)
Read/Write
Initial Value
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
to
Table 23-16 on page
UBRR7
RW
f
U2Xn = 0
UBRR
51
25
12
8
6
3
2
OSC
7
0
353). The error values are calculated using the following equation:
= 2.0000 MHz
Error
UBRR6
RW
6
0
Error
0.2%
0.2%
0.2%
-3.5%
-7.0%
8.5%
8.5%
[ ]
%
UBRR5
RW
=
5
0
U2Xn = 1
UBRR
103
51
25
16
12
8
6




367. UBRR values which yield an actual baud rate
BaudRate
UBRR4
RW
BaudRate
4
0
Error
0.2%
0.2%
0.2%
2.1%
0.2%
-3.5%
-7.0%
Closest
UBRR3
RW
3
0
Match
f
U2Xn = 0
UBRR
95
47
23
15
11
7
5
OSC
ATmega128RFA1
UBRR2
RW
−
= 3.6864 MHz
2
0
1

⋅  

"Asynchronous Operational
100
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
UBRR1
RW
1
0
%
UBRR0
U2Xn = 1
UBRR
191
95
47
31
23
15
11
RW
0
0
Table 23-14
UBRR1L
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
365