CC2500_06 Datasheet, PDF (51/84 Pages) Texas Instruments – Single Chip Low Cost Low Power RF Transceiver

CC2500
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
of CC2500.
The two FIFOs are accessed through one 8-bit
register. Write operations write to the TX FIFO,
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
PRELIMINARY Data Sheet (Rev.1.2) SWRS040A
Page 51 of 83