Datasheet

Register 10: Hibernation RTC Sub Seconds (HIBRTCSS), offset 0x028
This register contains the RTC sub seconds counter and match values. The RTC value can be read
by first reading the HIBRTCC register, reading the RTCSSC field in the HIBRTCSS register, and
then rereading the HIBRTCC register. If the two values for HIBRTCC are equal, the read is valid.
Note: Except for the HIBIO and a portion of the HIBIC register, all other Hibernation module
registers are on the Hibernation module clock domain and have special timing requirements.
Software should make use of the WRC bit in the HIBCTL register to ensure that the required
timing gap has elapsed. If the WRC bit is clear, any attempted write access is ignored. See
“Register Access Timing” on page 565. The HIBIO register and bits RSTWK, PADIOWK and
WC of the HIBIC register do not require waiting for write to complete. Because these registers
are clocked by the system clock, writes to these registers/bits are immediate.
Writing to registers other than the HIBCTL and HIBIM before the CLK32EN bit in the HIBCTL
register has been set may produce unexpected results.
Note: There is a minimum system clock rate of three times the HIB clock rate to properly read the
HIBRTCSS register.
Hibernation RTC Sub Seconds (HIBRTCSS)
Base 0x400F.C000
Offset 0x028
Type RW, reset 0x0000.0000
16171819202122232425262728293031
RTCSSMreserved
RWRWRWRWRWRWRWRWRWRWRWRWRWRWRWROType
0000000000000000Reset
0123456789101112131415
RTCSSCreserved
ROROROROROROROROROROROROROROROROType
0000000000000000Reset
DescriptionResetTypeNameBit/Field
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0ROreserved31
RTC Sub Seconds Match
The match value is contained in this field in one RTCOSC clock
increments. A read returns the current seconds match value.
0x0000RWRTCSSM30:16
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0ROreserved15
RTC Sub Seconds Count
This field contains the sub second RTC count and is read as RTCOSC
clock units. For the 32.768-kHz clock source, this would be in units of
1/32,768 seconds.
0x0000RORTCSSC14:0
601December 13, 2013
Texas Instruments-Advance Information
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TM4C129XNCZAD Microcontroller