CC1010-RTY1 datasheet(73/152 Pages) TI

73 / 152 page

CC1010

SWRS047

Page 73 of 152

rate as set by SPCR.DORD, SPCR.CPOL,

SPCR.CPHA and SPCR.SPR.

Reading data from SPDR will read the

input buffer, which is only updated after

each complete transmission. This means

that a new byte can be written to SPDR

before reading the newly received byte in

order to maximise the data rate.

If data is written to SPDR while a

transmission is in progress, this is

regarded as a collision. After each new

byte written to SPDR, the write collision flag

SPSR.WCOL is updated. If a collision

occurs, the data written to SPDR is ignored

and the data must be written to SPDR

again for it to be sent.

It is also possible to check the SPI status

bit, SPSR.SPA, before writing to SPDR to

avoid collisions. This bit is set only when

data is being transmitted.

SPI timing, data order, clock polarity and

clock phase are shown in Figure 18.

It is also possible to use the master SPI

interface to interface with a two-pin serial

interface that uses a bi-directional data

line (such as the interface used by the

Chipcon CC1000 RF transceiver). In this

case, you would connect the MO and MI

pins together on your PCB, as shown in

Figure 17. In the software, the P0DIR.1 bit

must be set correctly according to whether

data is being written or read.

CC1010

Two-wire

peripheral

SCK

DIO

DCLK

Figure 17. Two-wire serial interface

CC1010-RTY1 데이터시트(PDF) 73 Page - Texas Instruments

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