K60P100M100SF2RM Datasheet, PDF (789/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Field
5
MASKDONE
4
AR
3–2
Reserved
1–0
FUFMOD
Chapter 33 Random Number Generator (RNGB)
RNG_CR field descriptions (continued)
Mask done interrupt.
Description
Masks interrupts generated upon completion of seed and self test modes. The status of these jobs can be
viewed by:
• Reading RNG_SR and viewing the seed done and self test done bits (RNG_SR[SDN, STDN])
• Viewing RNG_CMD for generate seed or self test bits (RNG_CMD[GS,ST]) being set, indicating
that the operation is still taking place.
0 No mask applied.
1 Mask applied.
Auto-reseed.
Setting this bit allows the RNGB to automatically generate a new seed whenever one is needed. This
allows software to never use the RNG_CMD[GS], although it is still possible. A new seed is needed
whenever the RNG_SR[RS] is set.
0 Do not enable automatic reseeding.
1 Enable automatic reseeding.
This read-only field is reserved and always has the value zero.
Reserved, must be cleared.
FIFO underflow response mode.
Controls the RNGB's response to a FIFO underflow condition.
00 Return all zeros and set RNG_ESR[FUFE]
01 Return all zeros and set RNG_ESR[FUFE]
10 Generate bus transfer error
11 Generate interrupt and return all zeros (Overrides RNG_CR[MASKERR])
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
789