CC2430 Datasheet, PDF (134/234 Pages) Texas Instruments – A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee-TM

CC2430
unrolling is used, so that a new byte can
be written to RNDH every clock cycle.
CRC calculations start. Usually the seed
value should be 0x0000 or 0xFFFF.
Note that the LFSR must be properly
seeded by writing to RNDL, before the
13.8.3 Random Number Generator Registers
This section describes the Random Number Generator registers.
RNDL (0xBC) – Random Number Generator Data Low Byte
Bit Name
[7:0] _RNDL[7:0]
Reset R/W
0xFF R/W
Description
Random value/seed or CRC result, low byte
When used for random number generation writing this register
twice will seed the random number generator. Writing to this
register copies the 8 LSBs of the LFSR to the 8 MSBs and
replaces the 8 LSBs with the data value written.
The value returned when reading from this register is the 8 LSBs
of the LSFR.
When used for random number generation, reading this register
returns the 8 LSBs of the random number. When used for CRC
calculations, reading this register returns the 8 LSBs of the CRC
result.
RNDH (0xBD) – Random Number Generator Data High Byte
Bit Name
[7:0] _RNDH[7:0]
Reset R/W
0xFF R/W
Description
Random value or CRC result/input data, high byte
When written, a CRC16 calculation will be triggered, and the data
value written is processed starting with the MSB bit.
The value returned when reading from this register is the 8 MSBs
of the LSFR.
When used for random number generation, reading this register
returns the 8 MSBs of the random number. When used for CRC
calculations, reading this register returns the 8 MSBs of the CRC
result.
CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A
Page 134 of 232