AT86RF230 datasheet(11/98 Pages) ATMEL

部件名	AT86RF230

功能描述	Low Power 2.4 GHz Radio Transceiver for ZigBee??and IEEE 802.15.4??Applications

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制造商	ATMEL [ATMEL Corporation]

网页	http://www.atmel.com

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5131D-ZIGB-12/03/07

AT86RF230

6.1 SPI Timing Description

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.

Figure 6-2. SPI Timing, Global Map and Definition of Timing Parameters t5, t6, t8 and t9

Figure 6-3. SPI Timing, Detailed View and Definition of Timing Parameters t0 to t4

Bit 7

Bit 6

t1

t0

t2

Bit 5

t4

t3

Bit 7

Bit 6

Bit 5

SCLK

SEL

MOSI

MISO

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.

SEL = L enables the MISO output driver of the radio transceiver. The MSB of MISO is

valid after t1 (see section 11.4 parameter 11.4.3) and is updated at each falling edge of

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

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ATMEL Corporation	AT86RF230	423Kb / 50P	ZigBee/IEEE 802.15.4-Transceiver
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