C2510Fx / CC2511Fx
14.12.3
RX Termination Timer
If the system can expect the transmission to
have started when enabling the receiver, the
MCSM2.RX_TIME_RSSIfunction can be used.
The radio controller will then terminate RX if
the first valid carrier sense sample indicates
no carrier (RSSI below threshold). See Section
14.10.4 on Page 200 for details on Carrier
Sense.
CC2510Fx/CC2511Fx has optional functions for
automatic termination of RX after
a
programmable time. The termination timer
starts when in RX state. The timeout is
programmable with the MCSM2.RX_TIME
setting. When the timer expires, the radio
controller will check the condition for staying in
RX; if the condition is not met, RX will
terminate.
If RX terminates due to no carrier sense when
the MCSM2.RX_TIME_RSSI function is used,
or if no sync word was found when using the
MCSM2.RX_TIME timeout function, the chip
will always go back to IDLE.
The programmable conditions are:
•
MCSM2.RX_TIME_QUAL=0:
Continue
receive if sync word has been found
•
MCSM2.RX_TIME_QUAL=1:
receive if sync word has been found or
preamble quality is above threshold
(PQT)
Continue
14.13 Frequency Programming
The frequency programming
in
the
MDMCFG0.CHANSPC_M
and
CC2510Fx/CC2511Fx is designed to minimize the
programming needed in a channel-oriented
system.
MDMCFG1.CHANSPC_E registers. The channel
spacing registers are mantissa and exponent
respectively.
To set up a system with channel numbers, the
desired channel spacing is programmed with
fref
218
∆fCHANNEL
=
⋅
(
256 + CHANSPC _ M
⋅ 2CHANSPC _ E ⋅ CHAN
)
SWRS055D
Page 206 of 243
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