ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 148

• 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

11.2.2 I/O Clock – clk
11.2.3 Flash Clock – clk
11.2.4 Asynchronous Timer Clock – clk
11.2.5 ADC Clock – clkADC
11.3 Clock Sources
11.3.1 Default Clock Source
11.3.2 Clock Start-up Sequence
148
ATmega128RFA1
I/O
FLASH
The I/O clock is used by the majority of the I/O modules, like Timer/Counters, SPI, and
USART. The I/O clock is also used by the External Interrupt module, but note that some
external interrupts are detected by asynchronous logic, allowing such interrupts to be
detected even if the I/O clock is halted. Also note that start condition detection in the 2-
wire serial interface (TWI) module is carried out asynchronously when clk
Similar the TWI address recognition in all sleep modes also occurs asynchronously.
The Flash clock controls operation of the Flash interface. The Flash clock is usually
active simultaneously with the CPU clock.
The Asynchronous Timer clock allows the Asynchronous Timer/Counter to be clocked
directly from an external clock or an external 32 kHz clock crystal. The dedicated clock
domain allows using this Timer/Counter as a real-time counter even if the device is in
sleep mode.
The ADC is provided with a dedicated clock domain. This allows halting the CPU and
I/O clocks in order to reduce noise generated by digital circuitry. This gives more
accurate ADC conversion results.
The device has the following clock source options, selectable by Flash Fuse bits as
shown below. The clock from the selected source is input to the AVR clock generator,
and routed to the appropriate modules.
Table 11-1. Device Clocking Options Select
The device is shipped with internal RC oscillator at 16.0 MHz, the 1:2 prescaler enabled
and with the fuse CKDIV8 programmed, resulting in 1.0 MHz system clock. The startup
time is set to maximum time. (CKSEL = "0010", SUT = "10", CKDIV8 = "0"). The default
setting ensures that all users can make their desired clock source setting using any
available programming interface.
Any clock source needs a minimum number of oscillating cycles before it can be
considered stable.
Device Clocking Option
Transceiver clock
Reserved
Internal 128 kHz RC Oscillator
Calibrated Internal RC Oscillator
External Clock
Reserved
Notes:
ASY
1. For all fuses “1” means unprogrammed while “0” means programmed.
1111 – 0110
0101 - 0100
0011
0010
0000
0001
CKSEL3:0
(1)
8266A-MCU Wireless-12/09
I/O
is halted.