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16.7.1.3 IRQFLAGSTAT Register (Offset = 8h) [reset = X]
IRQFLAGSTAT is shown in Figure 16-6 and described in Table 16-8.
Interrupt Status
Figure 16-6. IRQFLAGSTAT Register
31 30 29 28 27 26 25 24
NEED_CLOCK RESERVED
R-X R-X
23 22 21 20 19 18 17 16
RESERVED
R-X
15 14 13 12 11 10 9 8
RESERVED
R-X
7 6 5 4 3 2 1 0
RESERVED SHUTDOWN_ RDY
OVF
R-X R-X R-X
Table 16-8. IRQFLAGSTAT Register Field Descriptions
Bit Field Type Reset Description
31 NEED_CLOCK R X
1: Indicates that the TRNG is busy generating entropy or is in one of
its test modes - clocks may not be turned off and the power supply
voltage must be kept stable. 0: TRNG is idle and can be shut down
30-2 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.
1 SHUTDOWN_OVF R X
1: The number of FROs shut down (i.e. the number of '1' bits in the
ALARMSTOP register) has exceeded the threshold set by
ALARMCNT.SHUTDOWN_THR Writing '1' to
IRQFLAGCLR.SHUTDOWN_OVF clears this bit to '0' again.
0 RDY R X
1: Data are available in OUT0 and OUT1. Acknowledging this state
by writing '1' to IRQFLAGCLR.RDY clears this bit to '0'. If a new
number is already available in the internal register of the TRNG, the
number is directly clocked into the result register. In this case the
status bit is asserted again, after one clock cycle.
1166
Random Number Generator SWCU117A–February 2015–Revised March 2015
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