CC1110-RTY1 datasheet(182/203 Pages) TI

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CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 182 of 202

0xDF11: DEVIATN – Modem deviation setting

Bit

Field Name

Reset

R/W

Description

Reserved

6:4

DEVIATION_E[2:0]

100

R/W

Deviation exponent

Reserved

2:0

DEVIATION_M[2:0]

111

R/W

When MSK modulation is enabled:

Sets fraction of symbol period used for phase change.

When 2-FSK/GFSK modulation is enabled:

Deviation mantissa, interpreted as a 4-bit value with MSB

implicit 1. The resulting FSK deviation is given by:

DEVIATION

xosc

dev

DEVIATION

)

(

⋅

The default values give ±47.607 kHz deviation, assuming

26.0 MHz crystal frequency.

0xDF12: MCSM2 – Main Radio Control State Machine configuration

Bit

Field Name

Reset

R/W

Description

7:5

000

Reserved

RX_TIME_RSSI

R/W

Direct RX termination based on RSSI measurement (carrier

sense). For ASK/OOK modulation, RX times out if there is

no carrier sense in the first 8 symbol periods.

RX_TIME_QUAL

R/W

When the RX_TIME timer expires, the chip checks 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]

111

R/W

Timeout for sync word search in RX. The timeout is relative

to the programmed EVENT0 timeout. The RX timeout is

scaled by 1 bit less than the EVENT0 timeout with respect

to the WORCTRL.WOR_RES setting, as very long timeouts

probably also will use very low RX duty cycles.

Setting

RX timeout

Duty cycle, WOR

0 (000)

TEVENT0 / 2

(3+WOR_RES)

12.5% / 2

WOR_RES

1 (001)

TEVENT0 / 2

(4+WOR_RES)

6.25% / 2

WOR_RES

2 (010)

TEVENT0 / 2

(5+WOR_RES)

3.125% / 2

WOR_RES

3 (011)

TEVENT0 / 2

(6+WOR_RES)

1.563% / 2

WOR_RES

4 (100)

TEVENT0 / 2

(7+WOR_RES)

0.781% / 2

WOR_RES

5 (101)

TEVENT0 / 2

(8+WOR_RES)

0.391% / 2

WOR_RES

6 (110)

TEVENT0 / 2

(9+WOR_RES)

0.195% / 2

WOR_RES

7 (111)

Until end of packet

N/A (no timeout)

Note that the RC oscillator must be enabled in order to use

setting 0-6, because the timeout counts RC oscillator

periods.

The timeout counter resolution is limited: With RX_TIME=0,

the timeout count is given by the 13MSBs of EVENT0,

decreasing to the 7MSBs of EVENT0 with RX_TIME=6.

CC1110-RTY1 Datasheet(PDF) 182 Page - Texas Instruments

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