CC1110-RTR1 datasheet(156/203 Pages) TI

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CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 156 of 202

RFST

Value

Command

Strobe

Name

Description

0x00

SFSTXON

Enable and calibrate frequency synthesizer (if

MCSM0.FS_AUTOCAL=1). While in

RX / TX issuing this command strobe will force the radio to go to a wait state where only

the synthesizer is running (for quick RX / TX turnaround).

0x01

SCAL

Calibrate frequency synthesizer and turn it off (enables quick start).

0x02

SRX

Enable RX. Perform calibration first if coming from IDLE and

MCSM0.FS_AUTOCAL=1.

0x03

STX

In IDLE state: Enable TX. Perform calibration first if

MCSM0.FS_AUTOCAL=1.

If in RX state and CCA is enabled: Only go to TX if channel is clear.

0x04

SIDLE

Exit RX / TX, turn off frequency synthesizer.

0x05

SAFC

Perform AFC adjustment of the frequency synthesizer

all

others

SNOP

No operation.

Table 42: Strobe commands

15.2 Radio Registers

The operation of the radio is configured

through a set of RF registers. These RF

registers are mapped to XDATA memory

space as shown in Figure 7 on page 33.

In addition to configuration registers, the

registers

also

provide

status

information from the radio.

The RF registers control/status bits are

referred to where appropriate in the

following sections while section 15.17 on

page 172 gives a full description of all RF

registers.

15.3 Interrupts

The radio is associated with two interrupt

vectors on the CPU. These are the

RFTXRX interrupt (interrupt 0) and the

RFIF interrupt (interrupt 12) with the

following functions

•

RFTXRX:

RX data ready or TX data

complete

•

RF:

all other RFIF interrupt

flags

The RF interrupt vector combines the

interrupts in RFIF shown on page 157.

Note that these RF interrupts are rising-

edge triggered. Thus an interrupt is

generated when e.g. the SFD status flag

goes from 0 to 1.

The RF interrupt can also be used to

trigger a timer capture in Timer 1.

The RF interrupt flags are described in the

next section.

15.3.1 Interrupt registers

Two of the main interrupt control SFR

registers are used to enable the RF and

RFTXRX

interrupts.

These

are

the

following:

•

RFTXRX

: IEN0. RFTXRXIE

•

: IEN2.RFIE

Two main interrupt flag SFR registers hold

the RF and RFERR interrupt flags. These

are the following:

•

RFTXRX

: TCON. RFTXRX

•

: S1CON.RFIF

Refer to section 12.7 for details about the

interrupts.

The RF interrupt is the combined interrupt

from six different sources in the radio. Two

SFR registers are used for setting the six

individual RFIF radio interrupt flags and

interrupt enables. These are the RFIF and

RFIM registers.

The interrupt flags in SFR register RFIF

show the status for each interrupt source

for the RF interrupt vector.

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