CC1110-RTR1 datasheet(159/203 Pages) TI

159 / 203 page

CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 159 of 202

; Start radio TX

; simple example, assumes required frequency, modulation format and

; data rate has been set in RF registers

;

MOV

DPTR,PA_TABLE0

;setting PA output power

MOV

A,#0FFh

;

MOVX

@DPTR,A

;

MOV

CLKCON,#00H

;select 26 MHz XOSC

MOV

RFST,#03H

;start TX with STX command strobe

C1:

JNB

IE0,C1

;wait for interrupt flag telling radio is

CLR

IE0

;ready to accept data, then write

MOV

RFD,#02H

;first data to radio, packet length=2

C2:

JNB

IE0,C2

;wait for radio

CLR

IE0

;

MOV

RFD,#12H

;send first byte in payload

C3:

JNB

IE0,C3

;wait for radio

CLR

IE0

;

MOV

RFD,#34H

;send second byte in payload

;done

Figure 35: Simple RF transmit example

15.5 Data Rate Programming

The data rate used when transmitting, or

the data rate expected in receive is

programmed by the MDMCFG3.DRATE_M

and the MDMCFG4.DRATE_E configuration

registers. The data rate is given by the

formula below. As the formula shows, the

programmed data rate depends on the

crystal frequency.

()

XOSC

DRATE

DATA

DRATE

⋅

256

The following approach can be used to

find suitable values for a given data rate:

256

log

−

⋅

⎥

⎦

⎥

⎢

⎣

⎢

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

⋅

DRATE

XOSC

DATA

XOSC

DATA

DRATE

If DRATE_M is rounded to the nearest

integer and becomes 256, increment

DRATE_E and use DRATE_M=0.

The data rate can be set from 1.2 kbps to

500 kbps with the minimum step size as

shown in Table 43.

Data rate

start

Typical

data rate

Data rate

stop

Data rate

step size

0.8 kbps

1.2/2.4

kbps

3.17 kbps

0.0062 kbps

3.17 kbps

4.8 kbps

6.35 kbps

0.0124 kbps

6.35 kbps

9.6 kbps

12.7 kbps

0.0248 kbps

12.7 kbps

19.6 kbps

25.4 kbps

0.0496 kbps

25.4 kbps

38.4 kbps

50.8 kbps

0.0992 kbps

50.8 kbps

76.8 kbps

101.6 kbps

0.1984 kbps

101.6 kbps

153.6 kbps

203.1 kbps

0.3967 kbps

203.1 kbps

250 kbps

406.3 kbps

0.7935 kbps

406.3 kbps

500 kbps

1.5869 kbps

Table 43: Data rate step size

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