Interrupts And Prs Output - Silicon Laboratories EFR32xG14 Wireless Gecko Reference Manual

To generate periodically recurring events, it is possible to mask out parts of the compare match values. By configuring COMPMASK in
RTCC_CCx_CTRL, parts of the compare values will be masked out, limiting which part of the compare register being subject to com-
parison with the counter. Figure 13.6 RTCC Compare mask illustration, COMPMASK=11 on page 384
MASK when in normal mode and calendar mode.
31
CC_CTRL_COMPMASK
MONTHT MONTHU
31 30 27 26
MASKED
Upon a compare match, the respective Capture/Compare interrupt flag CCx is set. Additionally, the event selected by the CMOA setting
is generated on the corresponding PRS output. This is illustrated in
page 382.

13.3.3 Interrupts and PRS Output

The RTCC has one interrupt for each of its 3 Capture/Compare channels, CC0, CC1, and CC2. Each Capture/Compare channel has a
PRS output with configurable actions upon compare match.
The interrupt flag CNTTICK is set each time the main counter receives a tick (each second in calendar mode). In calendar mode, there
are also interrupt flags being set each minute, hour, day, week, and month.
Upon oscillator failure detection, the OSCFAIL flag will be set.
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RTCC_DATE
[0b000,
DAYOW]
[MONTHT,MONTHU]
Compare match
[MONTHT,MONTHU]
[DAYT,DAYU]
RTCC_CCx_DATE
Figure 13.5. RTCC Compare in calendar mode, COMPBASE = CNT
CCV
21 20
DAYT DAYU HOURT
25 24 21 20 19
Figure 13.6. RTCC Compare mask illustration, COMPMASK=11
RTCC_TIME
[DAYOMT,
DAYOMU]
RTCC_CCx_CTRL_DAYCC
MASK
=
MASK
RTCC_CCx_TIME
HOURU MINT
18 15 14 12 11
Subject to comparison
Figure 13.3 RTCC Compare match and PRS output illustration on
RTCC - Real Time Counter and Calendar
illustrates the effect of COMP-
MINU SECT SECU
8 7 5 4
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