IP2022 User’s Manual—Peripherals www.ubicom.com 301 4.8 Comparator The   IP2022   has   an   on-chip   analog   comparator   which   uses
alternate functions of the RG0, RG1, and RG2 port pins. The RG1
and RG2 pins are the comparator negative and positive inputs,
respectively, while the RG0 pin is the comparator output pin. To
use  the  comparator,  software  must  program  the  port  direction
register (RGDIR) so that RG1 and RG2 are inputs. RG0 may be
set up as a comparator output pin. Figure 4-14  Analog Comparator Block Diagram The comparator enable bits are cleared on reset, which disables
the comparator. To avoid drawing additional current during power-
down mode, the comparator should be disabled before entering
power-down  mode. A 50 mV hysteresis is applied between the
inputs, when the CMPHYS bit is set in the CMPCFG register. 515-017.eps + -  CMPEN,
CMPHYS    CMPRES    CMPOE RG2 RG0 RG1