XC2700 Datasheet, PDF (45/62 Pages) Infineon Technologies AG – 16/32-Bit Single-Chip Microcontroller

5.3
Application Hints
XC2700 Derivatives
XC2000 Family / Alpha Line
Detailed Errata Description
ADC_AI.H002 Minimizing Power Consumption of an ADC Module
For a given number of A/D conversions during a defined period of time, the total energy
(power over time) required by the ADC analog part during these conversions via supply
V_DDPA is approximately proportional to the converter active time.
Recommendation for Minimum Power Consumption:
In order to minimize the contribution of A/D conversions to the total power consumption,
it is recommended
1. to select the internal operating frequency of the analog part (f_ADCI) near the maximum
value specified in the Data Sheet, and
2. to switch the ADC to a power saving state (via ANON) while no conversions are
performed. Note that a certain wake-up time is required before the next set of
conversions when the power saving state is left.
Note: The selected internal operating frequency of the analog part that determines the
conversion time will also influence the sample time t_S. The sample time t_S can
individually be adapted for the analog input channels via bit field STC.
CAPCOM12_X.H001 Enabling or Disabling Single Event Operation
The single event operation mode of the CAPCOM1/2 unit eliminates the need for
software to react after the first compare match when only one event is required within a
certain time frame. The enable bit SEEy for a channel CCy is cleared by hardware after
the compare event, thus disabling further events for this channel.
One Channel in Single Event Operation
As the Single Event Enable registers CC1_SEE, CC2_SEE are not located in the bit-
addressable SFR address range, they can only be modified by instructions operating on
data type WORD. This is no problem when only one channel of a CAPCOM unit is used
in single event mode.
Two or more Channels in Single Event Operation
When two or more channels of a CAPCOM unit are independently operating in single
event mode, usually an OR instruction is used to enable one or more compare events in
register CCn_SEE, while an AND instruction may be used to disable events before they
Errata Sheet
45
V1.7, 2014-10