CC2550 Datasheet, PDF (23/50 Pages) Texas Instruments – Single Chip Low Cost Low Power RF-Transmitter

23 Radio Control
MANCAL
3,4,5
CAL_COMPLETE
SCAL
SIDLE
IDLE
1
STX | SFSTXON
SPWD
CSn = 0
SXOFF
CSn = 0
SLEEP
0
XOFF
2
FS_WAKEUP
6,7
FS_AUTOCAL = 00 | 10 | 11
&
STX | SFSTXON
FS_AUTOCAL = 01
&
STX | SFSTXON
CALIBRATE
8
SFSTXON
FSTXON
18
SETTLING
9,10
STX
STX
TXOFF_MODE = 01
CAL_COMPLETE
TXOFF_MODE = 10
TX
19,20
TXFIFO_UNDERFLOW
TXOFF_MODE = 00
&
FS_AUTOCAL = 10 | 11
TX_UNDERFLOW
22
TXOFF_MODE = 00
&
FS_AUTOCAL = 00 | 01
CALIBRATE
12
CC2550
SFTX
IDLE
1
Figure 10: Radio Control State Diagram
CC2550 has a built-in state machine that is
used to switch between different operation
states (modes). The change of state is done
either by using command strobes or by
internal events such as TX FIFO underflow.
A simplified state diagram, together with
typical usage and current consumption, is
shown in Figure 4 on page 13. The complete
radio control state diagram is shown in Figure
10. The numbers refer to the state number
readable in the MARCSTATE status register.
This functionality is primarily for test purposes.
23.1 Power on start-up sequence
When the power supply is turned on, the
system must be reset. One of the following two
Preliminary Data Sheet (rev. 1.1) SWRS039
Page 23 of 51