Usage Notes; Module Stop Function Setting; Comparator C Operation In Module Stop State; Comparator C Operation In Software Standby Mode - Renesas RX100 Series User Manual

RX13T Group
28.4

Usage Notes

28.4.1

Module Stop Function Setting

Operation of comparator C can be disabled or enabled using module stop control register B (MSTPCRB). After the reset,
comparator C is halted. Register access is enabled by releasing the module stop state. For details, refer to section 11,
Low Power Consumption .
28.4.2

Comparator C Operation in Module Stop State

When the module stop state is entered while comparator C is operating, analog circuits in the comparator C is not
stopped and the analog power supply current is the same as that when comparator C is being used. If the analog power
supply current needs to be reduced in the module stop state, set the CMPCTL.HCMPON bit to 0 to stop comparator C.
28.4.3

Comparator C Operation in Software Standby Mode

When software standby mode is entered while comparator C is operating, analog circuits in the comparator C is not
stopped and the analog power supply current is the same as that when comparator C is being used. If the analog power
supply current needs to be reduced in software standby mode, set the CMPCTL.HCMPON bit to 0 to stop comparator C.
28.4.4 Comparator Operation while the 12-Bit A/D Convertor is in the Module-Stop
State
The same module stop signal controls the programmable gain amplifiers (PGAs) and the 12-bit A/D convertor. The
comparison of PGA output for the following pins is not possible while the 12-bit A/D convertor is in the module stop
state.
 PGA output for AN000 pin
 PGA output for AN001 pin
 PGA output for AN002 pin
The comparison for the following analog input pins is possible since they are directly connected to the comparator, even
if the 12-bit A/D convertor is in the module-stop state.
 AN000 pin
 AN001 pin
 AN002 pin
 AN003 pin
 AN004 pin
 AN005 pin
 AN006 pin
 AN007 pin
28.4.5

Setting the D/A Converter for Generating Reference Voltage

Set the D/A converter for generating reference voltage and wait for the D/A converter output settling time before
enabling the comparator. Similarly, before making any changes to the settings of the D/A converter stop the comparator
temporarily, and after the changes are made, wait for the D/A converter output settling time before enabling the
comparator.
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
28. Comparator C (CMPC)
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