FRS Signalling Processor
CMX882
Bit 2 is a User bit and may be freely used by the host. This bit has no effect on the message format or
encoding and will be reported in the Rx Data register for the receiving host to use as appropriate. This bit
could be used to indicate a special message, e.g. one containing handset or channel set-up information.
Bits 1-0 select the data scrambler seed used when transmitting User Data. The receiving CMX882 will
automatically de-scramble the received User Data using the setting indicated in the received Frame
Head. The receiving host can read the scrambler setting (0-3) used by the transmitter via register $C9
and may use this when returning messages. See also section 1.5.5.5.
Bit 1
Bit 0
MSK data scrambling setting:
0
0
1
1
0
1
0
1
Standard scrambling (seed = $FFFF)
Scramble Seed1 (see P0.2-3)
Scramble Seed2 (see P0.4-5)
No scrambling (seed = $0000)
1.6.12
$C8 PROGRAMMING REGISTER: 16-bit write-only
Bit:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
First
Block
Block /
Programming Data
Word
Number
Data
See section 1.6.20 for a description of this register.
2004 CML Microsystems Plc
44
D/882/7
CMLMICRO [ CML MICROCIRCUITS ]
