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PIC16C781 Datasheet(PDF) 98 Page - Microchip Technology

Part # PIC16C781
Description  8-Bit CMOS Microcontrollers with A/D, D/A, OPAMP, Comparators and PSMC
PDF  186 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16C781 Datasheet(HTML) 98 Page - Microchip Technology

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PIC16C781/782
DS41171A-page 96
Preliminary
 2001 Microchip Technology Inc.
FIGURE 12-4:
CONFIGURATION OF COMPARATOR C1 WITH DAC
EXAMPLE 12-2:
PROGRAMMING C1 FOR
PSMC FEEDBACK
;*
This code block will configure Comparator
;*
C1 for normal speed and output polarity,
;*
input on AN7, and Reference from the DAC
BANKSEL
TRISA
; Select Bank 1
BSF
TRISB,RB3
; RB3 as input
BSF
ANSEL,AN7
; Set RB3 as analog
BANKSEL
DACON0
; Select Bank 2
CLRF
DAC
; DAC=00h
MOVLW
B’10000000’ ; Enable, no out
MOVWF
DACON0
; DACREF = VDD
MOVLW
DAC_VALUE
MOVWF
DAC
; Trip Level
MOVLW
B’10001111’ ; C1; no out,
MOVWF
CM1CON0
; VREF1, AN7
12.2.3
EXAMPLE: LOW POWER WINDOW
COMPARATOR WITH INTERRUPT
To form a low power window comparator, Comparators
C1 & C2 are configured as follows:
• Common input RB0/INT/AN4/VREF
• Separate external reference voltages
• Programmed for slow speed operation
In addition, the output of comparator C2 must be
inverted for common polarity with C1.
A block diagram of the window comparator with exter-
nal connections is shown in Figure 12-4.
FIGURE 12-5:
WINDOW COMPARATOR WITH INTERRUPT
PIC16C78X
C1
+
-
RB3/AN7/OPA
C1POL = 0
C1OUT
PSMC
VDAC
DAC
INPUT
AN4
INPUT
C2
+
-
PIC16C78X
C1
+
-
CLPOL=1
CM2CON1<6>
CM2CON1<7>
VOLTAGE REFERENCE
VREF2
VREF1
CLPOL=0



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