Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User’s Manual
Chapter 26 Analog Comparator
FEUL620Q504 26–3
26.2.2 Comparator n Control Register (CMPnCON : n=0,1)
Address: 0F920H(CMP0CON), 0F928H(CMP1CON)
Access: R/W
Access size: 8 bits
Initial value: 00H
7 6 5 4 3 2 1 0
CMPnCON – – – – – CMPnRF CMPnD CMPnEN
R/W R/W R/W R/W R/W R/W R R R/W
Initial value 0 0 0 0 0 0 0 0
CMPnCON is a special function register (SFR) to control the Comparator.
Description of Bits
•
CMPnEN (bit 0)
The CMPnEN bit is used to control activation (ON) or deactivation (OFF) of the Comparator n.
It is used to indicate Comparator active status.
CMPnEN Description
0 Deactivates the Comparator n measurement is stopped(initial value)
1 Activates the Comparator n measurement is in progress
•
CMPnD (bit 1)
The CMPnD bit indicates the status of comparator n output (CMPnOUT shown in the Figure 26-1).
It is set to “1” when the voltage at CMPnP pin is larger than the voltage at CMPnM pin (CMPnP > CMPnM), is set
to “0” when the voltage at CMPnP pin is smaller than the voltage at CMnPM pin (CMPnP < CMPnM).
The last status of this bit remains after the comparator is deactivated(“0” is set to CMPnEN).
CMPnD Description
0 CMPnP < CMPnM (initial value)
1 CMPnP > CMPnM
•
CMPnRF (bit 2)
The CMPnRF indicate the status of comparator n measurement setting.
CMPnD is invalid until CMPnRF bit becomes 1 after starting measurement.
CMPnRF Description
0 CMPnD is invalid (initial value)
1 CMPnD is valid