LM3S1G21 Datasheet, PDF (617/955 Pages) Texas Instruments – Stellaris® LM3S1G21 Microcontroller

Stellaris^® LM3S1G21 Microcontroller
be greater than or equal to the value of COMP0. A COMP1 value that is less than COMP0 generates
unpredictable results.
Low-Band Operation
To operate in the low-band region, either the CIC field field in the ADCDCCTLn register must be
programmed to 0x0. This setting causes interrupts or triggers to be generated in the low-band region
as defined by the programmed operational mode. An example of the state of the interrupt/trigger
signal in the low-band region for each of the operational modes is shown in Figure 13-12 on page 617.
Note that a "0" in a column following the operational mode name (Always, Once, Hysteresis Always,
and Hysteresis Once) indicates that the interrupt or trigger signal is de-asserted and a "1" indicates
that the signal is asserted.
Figure 13-12. Low-Band Operation (CIC=0x0)
COMP1
COMP0
Always – 0 0 0 0 1 1 1 0 0 1 1 0 0 0 0 1
Once – 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 1
Hysteresis Always – 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 1
Hysteresis Once – 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1
Mid-Band Operation
To operate in the mid-band region, either the CIC field field in the ADCDCCTLn register must be
programmed to 0x1. This setting causes interrupts or triggers to be generated in the mid-band region
according the operation mode. Only the Always and Once operational modes are available in the
mid-band region. An example of the state of the interrupt/trigger signal in the mid-band region for
each of the allowed operational modes is shown in Figure 13-13 on page 618. Note that a "0" in a
column following the operational mode name (Always or Once) indicates that the interrupt or trigger
signal is de-asserted and a "1" indicates that the signal is asserted.
January 22, 2012
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