CC1100-RTR1 datasheet(24/100 Pages) TI1

24 / 100 page

CC1100

SWRS038D

Page 24 of 92

Configuration Software

CC1100 can be configured using the SmartRF®

Studio software [7]. The SmartRF® Studio

software is highly recommended for obtaining

optimum register settings, and for evaluating

performance and functionality. A screenshot of

the SmartRF® Studio user interface for

CC1100

is shown in Figure 6.

After chip reset, all the registers have default

values as shown in the tables in Section 33.

The optimum register setting might differ from

the default value. After a reset all registers that

shall be different from the default value

therefore needs to be programmed through

the SPI interface.

Figure 6: SmartRF

® Studio [7] User Interface

4-wire Serial Configuration and Data Interface

CC1100 is configured via a simple 4-wire SPI-

compatible interface (SI, SO, SCLK and CSn)

where

CC1100 is the slave. This interface is

also used to read and write buffered data. All

transfers on the SPI interface are done most

significant bit first.

All transactions on the SPI interface start with

a header byte containing a R/W;¯ bit, a burst

access bit (B), and a 6-bit address (A5 – A0).

The CSn pin must be kept low during transfers

on the SPI bus. If CSn goes high during the

transfer of a header byte or during read/write

from/to a register,

the transfer will be

cancelled. The timing for the address and data

transfer on the SPI interface is shown in Figure

7 with reference to Table 16.

When CSn is pulled low, the MCU must wait

until

CC1100 SO pin goes low before starting to

transfer the header byte. This indicates that

the crystal is running. Unless the chip was in

CC1100-RTR1 데이터시트(PDF) 24 Page - Texas Instruments

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