ST STM32G491 User Manual

RM0440 Rev 4 783/2126
RM0440 Comparator (COMP)
785
Bit 31 LOCK: COMP_CxCSR register lock
This bit is set by software and cleared by a hardware system reset. It locks the whole content
of the comparator x control register COMP_CxCSR[31:0]. When locked, all control bits and
flags can be read only but not written. When unlocked, the control bits can also be written by
software.
0: Unlock
1: Lock
Bit 30 VALUE: Comparator x output status
This read-only flag reflects the level of the comparator x output before the polarity
selector and blanking, as indicated in Figure 168.
Bits 29:24 Reserved, must be kept at reset value
Bit 23 SCALEN: V
REFINT
scaler enable
This bit controlled by software enables the operation of V
REFINT
scaler at the inverting input
of all comparator. To disable the V
REFINT
scaler, SCALEN bits of all COMP_CxCSR registers
must be set to Disable state. When the V
REFINT
scaler is disabled, the 1/4 V
REFINT
, 1/2
V
REFINT
, 3/4 V
REFINT
and V
REFINT
inputs of the multiplexer should not be selected.
0: Disable
1: Enable
Bit 22 BRGEN: V
REFINT
scaler resistor bridge enable
This bit controlled by software enables the operation of resistor bridge in the V
REFINT
scaler.
To disable the resistor bridge, BRGEN bits of all COMP_CxCSR registers must be set to
Disable state. When the resistor bridge is disabled, the 1/4 V
REFINT
, 1/2 V
REFINT
, and 3/4
V
REFINT
inputs of the input selector receive V
REFINT
voltage.
0: Disable
1: Enable
Bits 21:19 BLANKSEL[2:0]: Comparator x blanking signal select
This bitfield controlled by software selects the blanking signal for comparator channel x, as
shown in Table 197: Blanking sources.
Bits 18:16 HYST[2:0]: Comparator x hysteresis
This bitfield controlled by software selects the hysteresis of the comparator x:
000: No hysteresis
001: 10mV hysteresis
010: 20mv hysteresis
011: 30mV hysteresis
100: 40mV hysteresis
101: 50mV hysteresis
110: 60mV hysteresis
111: 70mV hysteresis
Bit 15 POL: Comparator x polarity
This bit controlled by software selects the comparator x output polarity:
0: Non-inverted
1: Inverted
Bits 14:9 Reserved, must be kept at reset value
Bit 8 INPSEL: Comparator x signal select for non-inverting input
This bitfield controlled by software selects the signal for the non-inverting input COMPx_INP
of the comparator x, as shown in Table 195: COMPx non-inverting input assignment.

ST STM32G491 Specifications

General

Brand	ST
Model	STM32G491
Category	Microcontrollers
Language	English