ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 152

• 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

11.8 Clock Output Buffer
11.9 Timer/Counter Oscillator
11.10 System Clock Prescaler
152
ATmega128RFA1
Table 11-10. Start-up Times for the Transceiver Oscillator Clock Selection
The device can output the system clock on the CLKO pin. To enable the output, the
CKOUT Fuse has to be programmed. This mode is suitable when the chip clock is used
to drive other circuits on the system. The clock also will be output during reset, and the
normal operation of I/O pin will be overridden when the fuse is programmed. Any clock
source, including the internal RC Oscillator, can be selected when the clock is output on
CLKO. If the System Clock Prescaler is used, it is the divided system clock that is
output.
Special attention is required to prevent unwanted radiation from the connected PCB
clock trace. Proper filtering can help to suppress higher harmonics.
The device can operate the Timer/Counter2 from the 32.768 kHz crystal oscillator or an
external clock source. See section
crystal connection.
The ATmega128RFA1 has a system clock prescaler, and the system clock can be
divided by setting the “CLKPR – Clock Prescale Register”. This feature can be used to
decrease the system clock frequency and the power consumption when the
requirement for processing power is low. This can be used with all clock source options,
and it will affect the clock frequency of the CPU and all synchronous peripherals. The
clocks clk
Clock Prescale Register on page
The prescaler clock division factor of the internal RC-Oscillator is different from all other
clock sources, see register description
Flash, EEPROM, Fuse- and Lock-bit programming is not allowed while using RC-
Oscillator with CLKPS=0xF (clk
When switching between prescaler settings, the System Clock Prescaler ensures that
no glitches occur in the clock system. It also ensures that no intermediate frequency is
higher than neither the clock frequency corresponding to the previous setting nor the
clock frequency corresponding to the new setting.
The prescaler is implemented as a ripple counter running at the frequency of the
undivided clock, which may be faster than the CPU's clock frequency. Hence, it is not
Power Conditions
fast rising power
slowly rising power
BOD enabled
fast rising power
slowly rising power
BOD enabled
fast rising power
slowly rising power
I/O
, clk
ADC
, clk
CPU
Start-up Time from
Power-down and
, and clk
Power-save
16K CK
16K CK
16K CK
258 CK
258 CK
1K CK
1K CK
1K CK
CPU
154.
= 16MHz).
FLASH
"Application Circuits" on page 493
CLKPR – Clock Prescale Register on page 154
are divided by a factor as shown in
Additional Delay
14CK + 4.1 ms
14CK + 4.1 ms
14CK + 4.1 ms
14CK + 65 ms
14CK + 65 ms
14CK + 65 ms
14CK + 0 ms
14CK + 0 ms
from Reset
8266A-MCU Wireless-12/09
CKSEL0
0
0
0
0
1
1
1
1
for the watch
CLKPR –
SUT1:0
00
01
10
11
00
01
10
11