ST7LITE1XB datasheet(103/157 Pages) STMICROELECTRONICS

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ST7LITE1xB

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ANALOG COMPARATOR (Cont’d)

Bit 4 = CMPIF Comparator Interrupt Flag

This bit is set by hardware when interrupt is gener-

ated at the rising edge (CINV = 0) or falling edge

(CINV = 1) of comparator output. This bit is

cleared by reading the CMPCR register. Writing to

this bit does not change the value.

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 in-

terrupt generation depending on interrupt flag

0: Interrupt not generated

1: Interrupt generated if interrupt flag is set

Note:

This bit should be set to enable interrupt only after

the comparator has been switched ON, i.e. when

CMPON is set.

Once CMPON bit is set, it is recommended to wait

the specified stabilization time before setting

CMPIE bit in order to avoid a spurious interrupt

(see section 13.12 on page 142).

Bit 2 : CMP Comparator Output

This bit is set or reset by software and cleared by

hardware reset. It stores the value of comparator

output.

Bit 1 = COUT Comparator Output Enable on Port

This bit is set or cleared by software. When this bit

is set, the comparator output is available on PA7

port.

0 : Comparator output not connected to PA7

1 : Comparator output connected to PA7

Bit 0 : CMPON Comparator ON/OFF

This bit is set or cleared by software and reset by

hardware reset. This bit is used to switch ON/OFF

the comparator, internal voltage reference and

current bias which provides 4µA current to both.

0: Comparator, Internal Voltage Reference, Bias

OFF (in power-down state).

1: Comparator, Internal Voltage Reference, Bias

Note: For the comparator interrupt generation, it

takes 250ns delay from comparator output change

to rising or falling edge of interrupt generated.

Table 21. Analog Comparator Register Map and Reset Values

Address

(Hex.)

Label

654

002Ch

VREFCR

Reset Value

VCEXT

VCBGR

VR3

VR2

VR1

VR0

002Dh

CMPCR

Reset value

CHYST

CINV

CMPIF

CMPIE

CMP

COUT

CMPON

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