CC113LRGP datasheet(28/87 Pages) TI2

28 / 87 page

CC113L

SWRS108B – MAY 2011 – REVISED JUNE 2014

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The synchronization word is a two-byte value set in the SYNC1 and SYNC0 registers. The sync word

provides byte synchronization of the incoming packet. A one-byte sync word can be emulated by setting

the SYNC1 value to the preamble pattern. It is also possible to emulate a 32 bit sync word by setting

MDMCFG2.SYNC_MODE to 3 or 7. The sync word will then be repeated twice.

CC113L supports both constant packet length protocols and variable length protocols. Variable or fixed

packet length mode can be used for packets up to 255 bytes. For longer packets, infinite packet length

mode must be used.

Fixed packet length mode is selected by setting PKTCTRL0.LENGTH_CONFIG=0. The desired packet

length is set by the PKTLEN register. This value must be different from 0.

In variable packet length mode, PKTCTRL0.LENGTH_CONFIG=1, the packet length is configured by the

first byte after the sync word. The packet length is defined as the payload data, excluding the length byte

and the optional CRC. The PKTLEN register is used to set the maximum packet length allowed in RX. Any

packet received with a length byte with a value greater than PKTLEN will be discarded. The PKTLEN

value must be different from 0.

With PKTCTRL0.LENGTH_CONFIG=2, the packet length is set to infinite and transmission and reception

will continue until turned off manually. As described in Section 5.10.1.1, this can be used to support packet

formats with different length configuration than natively supported by CC113L.

NOTE

The minimum packet length supported (excluding the optional length byte and CRC) is one

byte of payload data.

5.10.1.1 Arbitrary Length Field Configuration

The packet length register, PKTLEN, can be reprogrammed during RX. In combination with fixed packet

length mode ( PKTCTRL0.LENGTH_CONFIG=0), this opens the possibility to have a different length field

configuration than supported for variable length packets (in variable packet length mode the length byte is

the first byte after the sync word). At the start of reception, the packet length is set to a large value. The

MCU reads out enough bytes to interpret the length field in the packet. Then the PKTLEN value is set

according to this value. The end of packet will occur when the byte counter in the packet handler is equal

to the PKTLEN register. Thus, the MCU must be able to program the correct length, before the internal

counter reaches the packet length.

5.10.1.2 Packet Length > 255

The packet automation control register, PKTCTRL0, can be reprogrammed during RX. This opens the

possibility to receive packets that are longer than 256 bytes and still be able to use the packet handling

hardware

support.

the

start

the

packet,

the

infinite

packet

length

mode

(

PKTCTRL0.LENGTH_CONFIG=2) must be active. When receiving, the MCU reads out enough bytes to

interpret the length field in the packet and sets the PKTLEN register to mod(length, 256). When less than

256 bytes remains of the packet, the MCU disables infinite packet length mode and activates fixed packet

length mode ( PKTCTRL0.LENGTH_CONFIG=0). When the internal byte counter reaches the PKTLEN

value, the transmission or reception ends (the radio enters the state determined by RXOFF_MODE).

Automatic CRC appending/checking can also be used (by setting PKTCTRL0.CRC_EN=1).

Detailed Description

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