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SWRS037B – JANUARY 2006 – REVISED MARCH 2015
Table 5-33. 0x18: MCSM0 – Main Radio Control State Machine Configuration
BIT
FIELD
TYPE
RESET
DESCRIPTION
7:6
R0
Not Used.
5:4
FS_AUTOCAL[1:0]
R/W
0x0
Automatically calibrate when going to TX, or back to
IDLE:
The binary number is the setting and the result is when
to perform automatic calibration.
00 = Never (manually calibrate using SCAL strobe)
01 = When going from IDLE to TX (or FSTXON)
10 = When going from TX back to IDLE
11 = Every 4th time when going from TX to IDLE
3:2
PO_TIMEOUT
R/W
0x1
Programs the number of times the six-bit ripple counter
must expire after XOSC has stabilized before
CHP_RDY_N goes low.
The XOSC is off during power-down and if the regulated
digital supply voltage has sufficient time to stabilize while
waiting for the crystal to be stable, PO_TIMEOUT can be
set to 0. For robust operation it is recommended to use
PO_TIMEOUT=2.
The binary number is the setting, the result is the expire
count, and the definition is the timeout after XOSC start.
00 = 1 : Approx. 2.3
μ
s – 2.7
μ
s
01 = 16 : Approx. 37
μ
s – 43
μ
s
10 = 64 : Approx. 146
μ
s – 171
μ
s
11 = 256 : Approx. 585
μ
s – 683
μ
s
Exact timeout depends on crystal frequency.
In order to reduce start up time from the SLEEP state,
this field is preserved in powerdown (SLEEP state).
1:0
Reserved
R0
Defined on the transceiver version (CC1101)
Table 5-34. 0x22: FREND0 – Front End TX Configuration
BIT
FIELD
TYPE
RESET
DESCRIPTION
7:6
R0
Not Used.
5:4
LODIV_BUF_
R/W
0x1
Adjusts current TX LO buffer (input to PA).
CURRENT_TX[1:0]
The value to use in register field is given by
the SmartRF Studio
software.
3
R0
Not Used.
2:0
PA_POWER[2:0]
R/W
0x0
Selects PA power setting. This value is an
index to the PATABLE, which can be
programmed with up to 8 different PA
settings. In ASK mode, this selects the
PATABLE index to use when transmitting a
‘1’. PATABLE index zero is used in ASK when
transmitting a ‘0’. The PATABLE settings from
index ‘0’ to the PA_POWER value are used
for ASK TX shaping, and for power ramp-
up/ramp-down at the start/end of transmission
in all TX modulation formats.
Copyright © 2006–2015, Texas Instruments Incorporated
Detailed Description
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