PIC16CE625 Datasheet

IC型号：
PIC16CE625
PDF描述：
OTP 8-Bit CMOS MCU with EEPROM Data Memory
文件大小：
1208.41KB
PDF页数：
113页
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PIC16CE62X

The code example in Example 8-1 depicts the steps

required to con铿乬ure the comparator module. RA3 and

RA4 are con铿乬ured as digital output. RA0 and RA1 are

con铿乬ured as the V- inputs and RA2 as the V+ input to

both comparators.

8.3

Comparator Reference

EXAMPLE 8-1:

FLAG_REG

CLRF

MOVF

ANDLW

IORWF

MOVLW

MOVWF

BSF

MOVLW

MOVWF

INITIALIZING

COMPARATOR MODULE

An external or internal reference signal may be used

depending on the comparator operating mode. The

analog signal that is present at V

鈥?is compared to the

signal at V

+, and the digital output of the comparator

is adjusted accordingly (Figure 8-3).

FIGURE 8-3:

SINGLE COMPARATOR

BCF

CALL

MOVF

BCF

BSF

BCF

BSF

0X20

;Init flag register

;Init PORTA

;Move comparator contents to W

;Mask comparator bits

;Store bits in flag register

;Init comparator mode

;CM<2:0> = 011

;Select Bank1

;Initialize data direction

;Set RA<2:0> as inputs

;RA<4:3> as outputs

;TRISA<7:5> always read 鈥?鈥?/div>

STATUS,RP0 ;Select Bank 0

DELAY 10

;10碌s delay

CMCON,F

;Read CMCON to end change condition

PIR1,CMIF

;Clear pending interrupts

STATUS,RP0 ;Select Bank 1

PIE1,CMIE

;Enable comparator interrupts

STATUS,RP0 ;Select Bank 0

INTCON,PEIE ;Enable peripheral interrupts

INTCON,GIE ;Global interrupt enable

EQU

FLAG_REG

PORTA

CMCON,W

0xC0

FLAG_REG,F

0x03

CMCON

STATUS,RP0

0x07

TRISA

鈥?/div>

Output

IN鈥?/div>

IN+

Output

8.2

Comparator Operation

8.3.1

EXTERNAL REFERENCE SIGNAL

A single comparator is shown in Figure 8-3 along with

the relationship between the analog input levels and

the digital output. When the analog input at V

+ is less

than the analog input V

鈥? the output of the

comparator is a digital low level. When the analog input

at V

+ is greater than the analog input V

鈥? the output

of the comparator is a digital high level. The shaded

areas of the output of the comparator in Figure 8-3

represent the uncertainty due to input offsets and

response time.

When external voltage references are used, the

comparator module can be con铿乬ured to have the com-

parators operate from the same or different reference

sources. However, threshold detector applications may

require the same reference. The reference signal must

be between V

and V

, and can be applied to either

pin of the comparator(s).

8.3.2

INTERNAL REFERENCE SIGNAL

The comparator module also allows the selection of an

internally generated voltage reference for the

comparators. Section 13, Instruction Sets, contains a

detailed description of the Voltage Reference Module

that provides this signal. The internal reference signal

is used when the comparators are in mode

CM<2:0>=010 (Figure 8-2). In this mode, the internal

voltage reference is applied to the V

+ pin of both com-

parators.

漏

1998 Microchip Technology Inc.

Preliminary

DS40182A-page 43

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