CC2510FX Datasheet, PDF (229/253 Pages) List of Unclassifed Manufacturers – True System-on-Chip with Low Power RF Transceiver and 8051 MCU

CC2510Fx / CC2511Fx
0xDF12: MCSM2 – Main Radio Control State Machine configuration
Bit Field Name
Reset R/W Description
7:5 Reserved
R0 Reserved
4
RX_TIME_RSSI
0
R/W Direct RX termination based on RSSI measurement (carrier
sense). For OOK modulation, RX times out if there is no
carrier sense in the first 8 symbol periods.
3
RX_TIME_QUAL
0
R/W When the RX_TIME timer expires the chip stays in RX mode if
sync word is found when RX_TIME_QUAL=0, or either sync
word is found or PQT is set when RX_TIME_QUAL=1.
2:0 RX_TIME[2:0]
7 (111)
R/W Timeout for sync word search in RX. The timeout is relative to
the programmed EVENT0 timeout, which means that the duty
cycle can be set in wake-on-radio (WOR) mode.
The RX timeout in µs is given by EVENT0·C(RX_TIME, WOR_RES), where C is given by the table below (XOSC =
26 MHz):
RX_TIME[2:0] WOR_RES = 0 WOR_RES = 1 WOR_RES = 2 WOR_RES = 3
0 (000)
3.6058
18.0288
32.4519
46.8750
1 (001)
1.8029
9.0144
16.2260
23.4375
2 (010)
0.9014
4.5072
8.1130
11.7188
3 (011)
0.4507
2.2536
4.0565
5.8594
4 (100)
0.2254
1.1268
2.0282
2.9297
5 (101)
0.1127
0.5634
1.0141
1.4648
6 (110)
0.0563
0.2817
0.5071
0.7324
7 (111)
Until end of packet
As an example, EVENT0 = 34666, WOR_RES = 0 and RX_TIME = 6 corresponds to 1.96 ms RX timeout, 1 s
polling interval and 0.195% duty cycle. Note that WOR_RES should be 0 or 1 when using WOR.
The duty cycle is approximated by:
RX_TIME[2:0] WOR_RES = 0 WOR_RES = 1
0 (000)
12.50%
1.95%
1 (001)
6.250%
9765ppm
2 (010)
3.125%
4883ppm
3 (011)
1.563%
2441ppm
4 (100)
0.781%
NA
5 (101)
0.391%
NA
6 (110)
0.195%
NA
7 (111)
Until end of packet
Note that the RC oscillator must be enabled in order to use setting 0-6, because the timeout counts RC oscillator
periods. WOR mode does not need to be enabled.
The timeout counter resolution is limited: With RX_TIME=0, the timeout count is given by the 13 MSBs of EVENT0,
decreasing to the 7 MSBs of EVENT0 with RX_TIME=6.
CC2510Fx/CC2511Fx PRELIMINARY Data Sheet (Rev. 1.2) SWRS055A Page 229 of
252