Status Register (Status) - Texas Instruments AM1808 Technical Reference Manual

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27.3.15 Status Register (STATUS)

The STATUS register is shown in
NOTE: Out of reset, the STATUS register is write-protected. To disable write protection, correct keys
must be written to the KICKnR registers (see
31
15
Reserved
LEGEND: R = Read only; W1C = Write 1 to clear bit; -n = value after reset
Bit Field Value
31-7 Reserved 1
6 ALARM
0
1
5 DAYEVT
0
1
4 HREVT
0
1
3 MINEVT
0
1
2 SECEVT
0
1
1 RUN
0
1
0 BUSY
0
1
SPRUH82C – April 2013 – Revised September 2016
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Figure 27-18
Figure 27-18. Status Register (STATUS)
7
R-1
Table 27-17. Status Register (STATUS) Field Descriptions
Description
Reserved
Indicates if an alarm interrupt has been generated. Write a 1 to clear the ALARM status.
No new alarm interrupt was generated.
New alarm interrupt was generated.
When the (TIMER = 1) in the INTERRUPTS register, DAYEVT indicates if the DAYS register
incremented during the most recent time update.
DAYS register did not increment during the last time update.
DAYS register incremented during the last time update.
When the (TIMER = 1) in the INTERRUPTS register, HREVT indicates if the HOURS register
incremented during the most recent time update.
HOURS register did not increment during the last time update.
HOURS register incremented during the last time update.
When the (TIMER = 1) in the INTERRUPTS register, MINEVT indicates if the MINUTES register
incremented during the most recent time update.
MINUTES register did not increment during the last time update.
MINUTES register incremented during the last time update.
When the (TIMER = 1) in the INTERRUPTS register, SECEVT indicates if the SECONDS register
incremented during the most recent time update.
SECONDS register did not increment during the last time update.
SECONDS register incremented during the last time update.
Indicates if RTC is running or stopped.
RTC is stopped.
RTC is running.
Indicates if RTC is busy updating or is within 15 μs of updating the time and calendar registers.
RTC is free. The time, calendar, and control registers can be written to without contention.
RTC is or will soon be busy updating the time and calendar registers.
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and described in Table
Section 27.2.6).
Reserved
R-0
6 5 4
ALARM DAYEVT HREVT
R/W1C-0 R-0 R-0
27-17.
3 2 1
MINEVT SECEVT RUN
R-0 R-0 R-0
Real-Time Clock (RTC)
Registers
16
0
BUSY
R-0
1337