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16.7.1.8 ALARMCNT Register (Offset = 1Ch) [reset = X]
ALARMCNT is shown in Figure 16-11 and described in Table 16-13.
Alarm Control
Figure 16-11. ALARMCNT Register
31 30 29 28 27 26 25 24
RESERVED SHUTDOWN_CNT
R-X R/W-X
23 22 21 20 19 18 17 16
RESERVED SHUTDOWN_THR
R-X R/W-X
15 14 13 12 11 10 9 8
RESERVED
R-X
7 6 5 4 3 2 1 0
ALARM_THR
R/W-FFh
Table 16-13. ALARMCNT Register Field Descriptions
Bit Field Type Reset Description
31-30 RESERVED R X
Software should not rely on the value of a reserved. Writing any
other value than the reset value may result in undefined behavior.
29-24 SHUTDOWN_CNT R/W X
Read-only, indicates the number of '1' bits in ALARMSTOP register.
The maximum value equals the number of FROs.
23-21 RESERVED R X
Software should not rely on the value of a reserved. Writing any
other value than the reset value may result in undefined behavior.
20-16 SHUTDOWN_THR R/W X
Threshold setting for generating IRQFLAGSTAT.SHUTDOWN_OVF
interrupt. The interrupt is triggered when SHUTDOWN_CNT value
exceeds this bit field.
15-8 RESERVED R X
Software should not rely on the value of a reserved. Writing any
other value than the reset value may result in undefined behavior.
7-0 ALARM_THR R/W FFh
Alarm detection threshold for the repeating pattern detectors on each
FRO. An FRO 'alarm event' is declared when a repeating pattern (of
up to four samples length) is detected continuously for the number of
samples defined by this field's value. Reset value 0xFF should keep
the number of 'alarm events' to a manageable level.
1171
SWCU117A–February 2015–Revised March 2015 Random Number Generator
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