CC2500-RTR1 datasheet(57/96 Pages) TI

57 / 96 page

CC2500

SWRS040C

Page 57 of 89

32 Configuration Registers

The configuration of

CC2500 is done by

programming 8-bit registers. The optimum

configuration data based on selected system

parameters are most easily found by using the

SmartRF



Studio

software

[5].

Complete

descriptions of the registers are given in the

following tables. After chip reset, all the

registers have default values as shown in the

tables. 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.

There are 13 command strobe registers, listed

in Table 34. Accessing these registers will

initiate the change of an internal state or

mode. There are 47 normal 8-bit configuration

registers, listed in Table 35. Many of these

registers are for test purposes only, and need

not be written for normal operation of

CC2500.

There are also 12 status registers, which are

listed in Table 36. These registers, which are

read-only, contain information about the status

CC2500.

The two FIFOs are accessed through one 8-bit

while read operations read from the RX FIFO.

During the header byte transfer and while

writing data to a register or the TX FIFO, a

status byte is returned on the SO line. This

status byte is described in Table 17 on page

23.

Table 37 summarizes the SPI address space.

The address to use is given by adding the

base address to the left and the burst and R/W

bits on the top. Note that the burst bit has

different meaning for base addresses above

and below 0x2F.

Address

Strobe

Name

Description

0x30

SRES

Reset chip.

0x31

SFSTXON

Enable and calibrate frequency synthesizer (if MCSM0.FS_AUTOCAL=1). If in RX (with CCA):

Go to a wait state where only the synthesizer is running (for quick RX / TX turnaround).

0x32

SXOFF

Turn off crystal oscillator.

0x33

SCAL

Calibrate frequency synthesizer and turn it off. SCAL can be strobed from IDLE mode without

setting manual calibration mode (MCSM0.FS_AUTOCAL=0)

0x34

SRX

Enable RX. Perform calibration first if coming from IDLE and MCSM0.FS_AUTOCAL=1.

0x35

STX

In IDLE state: Enable TX. Perform calibration first if MCSM0.FS_AUTOCAL=1.

If in RX state and CCA is enabled: Only go to TX if channel is clear.

0x36

SIDLE

Exit RX / TX, turn off frequency synthesizer and exit Wake-On-Radio mode if applicable.

0x38

SWOR

Start automatic RX polling sequence (Wake-on-Radio) as described in Section 19.5 if

WORCTRL.RC_PD

=0.

0x39

SPWD

Enter power down mode when CSn goes high.

0x3A

SFRX

Flush the RX FIFO buffer. Only issue SFRX in IDLE or RXFIFO_OVERFLOW states.

0x3B

SFTX

Flush the TX FIFO buffer. Only issue SFTX in IDLE or TXFIFO_UNDERFLOW states.

0x3C

SWORRST

Reset real time clock to Event1 value.

0x3D

SNOP

No operation. May be used to get access to the chip status byte.

Table 34: Command Strobes

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