CC1010-RTY1 datasheet(104/152 Pages) TI

104 / 152 page

CC1010

SWRS047

Page 104 of 152

threshold for determining what constitutes

a Manchester coding violation can be

configured

RFCON.MLIMIT.

RFCON.MVIOL is set when, in bitmode,

the currently available bit in RFBUF.0 was

determined to violate Manchester coding,

or in bytemode, when one or more of the

bits in the byte currently available in

RFBUF were determined to violate the

Manchester coding. This can be used, for

example, to detect start of frame and end

of frame delimiter bytes.

Note that even if RFCON.MVIOL is set

when receiving data, RFBUF will still be set

to the "best guess" data received. In

applications

where

Manchester

violations are transmitted, it is therefore

advisable to ignore RFCON.MVIOL at

reception.

In order to be able to send Manchester

violations, MODEM0.DATA_FORMAT must

be changed to NRZ mode for the byte in

question. When in NRZ mode, two bytes

must be sent for each Manchester-coded

byte. A flagrant violation of Manchester

coding could be, for example, the two-byte

sequence

"11001100"-"00110011".

order

provide

this

functionality,

MODEM0.DATA_FORMAT is buffered in

much the same way as data so that the

change does not take effect until the

following byte.

During transmission, the desired data

format should be updated in connection

with writing new data to RFBUF. The byte

currently being transmitted from the shift

possible to have a NRZ preamble pattern

with Manchester data following. This is

illustrated in Figure 30.

NRZ Preamble

Byte sync

Data

Preamble

Bit value

Manchester data

Figure 30. Switching data mode after preamble

Changing the desired data mode during

reception

NRZ

preamble

and

Manchester data is straightforward. A new

value of MODEM0.DATA_FORMAT does not

take effect before an RF interrupt request

is generated. After having started a

reception using preamble detection/byte

synchronization and the NRZ data mode,

the DATA_FORMAT should be set to

Manchester.

The

whole

preamble

detection process will then work with NRZ

data and the new DATA_FORMAT will not

take

effect

until

valid

(NRZ)

synchronization byte is found and an

interrupt request generated.

It is not recommended to change the data

format during reception for new protocols,

but the functionality is included for

compatibility with existing protocols.

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