CC2500-RTR1 datasheet(51/84 Pages) TI

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CC2500

PRELIMINARY Data Sheet (Rev.1.2)

SWRS040A

Page 51 of 83

31 Configuration Registers

The configuration of

CC2500 is done by

programming 8-bit registers. The configuration

data based on selected system parameters

are most easily found by using the SmartRF®

Studio software. 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.

There are 14 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 address transfer and while writing

to a register or the TX FIFO, a status byte is

returned. This status byte is described in Table

17 on page 21.

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

read/write 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 (enables quick start). SCAL can be strobed in IDLE

state 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.

0x39

SPWD

Enter power down mode when CSn goes high.

0x3A

SFRX

Flush the RX FIFO buffer. Only issue in IDLE, TXFIFO_UNDERFLOW or RXFIFO_OVERFLOW

states.

0x3B

SFTX

Flush the TX FIFO buffer. Only issue in IDLE, TXFIFO_UNDERFLOW or RXFIFO_OVERFLOW

states.

0x3C

SWORRST

Reset real time clock.

0x3D

SNOP

No operation. May be used to pad strobe commands to two bytes for simpler software.

Table 34: Command strobes

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