ST7LITE49K2 datasheet(181/245 Pages) STMICROELECTRONICS

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ST7LITE49K2

On-chip peripherals

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Comparator control register (CMPxCR)

Reset Value: 1000 0000 (80h)

Bit 7 = CHYST Comparator hysteresis enable

This bit is set or cleared by software and set by hardware reset. When this bit is set, the

comparator hysteresis is enabled.

0: Hysteresis disabled

1: Hysteresis enabled

Note:

To avoid spurious toggling of the output of the comparator due to noise on the voltage

reference, it is recommended to enable the hysteresis.

Bit 6 = Reserved, Must be kept cleared

Bit 5 = CINV Comparator output inversion select

This bit is set or cleared by software and cleared by hardware reset. When this bit is set, the

comparator output is inverted.

If interrupt enable bit CMPIE is set in the CMPCR register, the CINV bit is also used to select

which type of level transition on the comparator output will generate the interrupt. When this

bit is reset, interrupt will be generated at the rising edge of the comparator output change

(COMP signal, refer to Figure 82 on page 179). When this bit is set, interrupt will be

generated at the falling edge of comparator output change (COMP signal, refer to Figure 82

on page 179).

0: Comparator output not inverted and interrupt generated at the rising edge of COMP

1: Comparator output inverted and interrupt generated at the falling edge of COMP

Bit 4 = CMPIF Comparator interrupt flag

This bit is set by hardware when interrupt is generated at the rising edge (CINV = 0) or

falling edge (CINV = 1) of comparator output. This bit is cleared by reading the CMPCR

0 : Comparator interrupt flag cleared

1 : Comparator interrupt flag set and can generate interrupt if CMPIE is set.

Bit 3 : CMPIE Comparator interrupt enable

This bit is set or reset by software and cleared by hardware reset. This bit enables or

disables the interrupt generation depending on interrupt flag

0: Interrupt not generated

1: Interrupt generated if interrupt flag is set

CHYST

CINV

CMPIF

CMPIE

CMP

COUT

CMPON

Read/write

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