ATMEGA256RZAV-8AU Atmel, ATMEGA256RZAV-8AU Datasheet - Page 11
![MCU ATMEGA2561/AT86RF230 64-TQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
ATMEGA256RZAV-8AU
Manufacturer Part Number
ATMEGA256RZAV-8AU
Description
MCU ATMEGA2561/AT86RF230 64-TQFP
Manufacturer
Atmel
Series
ATMEGAr
Datasheets
1.ATMEGA640V-8CU.pdf
(38 pages)
2.ATMEGA640V-8CU.pdf
(444 pages)
3.AT86RF230-ZU.pdf
(98 pages)
Specifications of ATMEGA256RZAV-8AU
Frequency
2.4GHz
Modulation Or Protocol
802.15.4 Zigbee
Applications
ISM, ZigBee™
Power - Output
3dBm
Sensitivity
-101dBm
Voltage - Supply
1.8 V ~ 3.6 V
Current - Receiving
15.5mA
Current - Transmitting
16.5mA
Data Interface
PCB, Surface Mount
Memory Size
256kB Flash, 4kB EEPROM, 8kB RAM
Antenna Connector
PCB, Surface Mount
Package / Case
64-TQFP
Wireless Frequency
2.4 GHz
Interface Type
JTAG, SPI
Output Power
3 dBm
For Use With
ATAVRISP2 - PROGRAMMER AVR IN SYSTEM
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Operating Temperature
-
Data Rate - Maximum
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
ATmega256
6.1 SPI Timing Description
Figure 6-2. SPI Timing, Global Map and Definition of Timing Parameters t
Figure 6-3. SPI Timing, Detailed View and Definition of Timing Parameters t
SCLK
MOSI
MISO
5131E-MCU Wireless-02/09
SEL
t
0
t
1
t
3
Bit 7
t
4
Bit 7
The SPI is designed to work in synchronous or asynchronous mode.
In synchronous mode, the CLKM output of the radio transceiver is used as the master
clock of the microcontroller. In this case the maximum SPI clock frequency is 8 MHz.
In asynchronous mode, the SPI master clock (SCLK) is generated by the
microcontroller itself. The maximum SPI clock rate is limited to 7.5 MHz using this
operating mode. If the clock signal from the radio transceiver pin CLKM is not required,
it may be disabled.
Figure 6-2 and Figure 6-3 illustrate the SPI timing and introduce its parameters. The
corresponding timing parameter definition is given in Table 11-4.
The SPI is based on a byte-oriented protocol and is always a bidirectional
communication between master and slave. The SPI master starts the transfer by
asserting SEL = L. Then the master generates eight SPI clock cycles to transfer a byte
to the radio transceiver (via MOSI). At the same time the slave transmits one byte to the
master (via MISO). When the master wants to receive one byte of data from the slave it
must also transmit one byte to the slave. All bytes are transferred MSB first. An SPI
transaction is finished by releasing SEL = H.
A SPI register access consists of two bytes, a Frame Buffer or SRAM access of two or
more bytes, as described in section 6.2.
valid after t
SCLK. If the MISO output driver is disabled, there is no internal pull-up resistor
connected to the output. Driving the appropriate signal level must be ensured by the
SEL = L enables the MISO output driver of the radio transceiver. The MSB of MISO is
t
2
1
(see section 11.4 parameter 11.4.3) and is updated at each falling edge of
Bit 6
Bit 6
5
, t
0
6
, t
to t
8
and t
4
9
Bit 5
Bit 5
AT86RF230
11