參數(shù)資料
型號: PIC16C620A-20/P301
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDIP18
封裝: 0.300 INCH, PLASTIC, DIP-18
文件頁數(shù): 41/108頁
文件大小: 674K
代理商: PIC16C620A-20/P301
PIC16C62X
DS30235G-page 38
Preliminary
1998 Microchip Technology Inc.
7.1
Comparator Conguration
There
are
eight
modes
of
operation
for
the
comparators. The CMCON register is used to select the
mode. Figure 7-2 shows the eight possible modes. The
TRISA register controls the data direction of the com-
parator pins for each mode. If the comparator mode is
changed, the comparator output level may not be valid
for the specied mode change delay shown in
Note:
Comparator interrupts should be disabled
during a comparator mode change other-
wise a false interrupt may occur.
FIGURE 7-2:
COMPARATOR I/O OPERATING MODES
-
+
C1
VIN-
VIN+
Off
(Read as '0')
RA0/AN0
RA3/AN3
A
CM<2:0> = 000
-
+
C2
VIN-
VIN+
Off
(Read as '0')
RA1/AN1
RA2/AN2
A
-
+
C1
VIN-
VIN+
Off
(Read as '0')
RA0/AN0
RA3/AN3
D
CM<2:0> = 111
-
+
C2
VIN-
VIN+
Off
(Read as '0')
RA1/AN1
RA2/AN2
D
-
+
C1
VIN-
VIN+
C1OUT
RA0/AN0
RA3/AN3
A
-
+
C2
VIN-
VIN+
C2OUT
RA1/AN1
RA2/AN2
A
CM<2:0> = 100
-
+
C1
VIN-
VIN+
C1OUT
RA0/AN0
RA3/AN3
A
-
+
C2
VIN-
VIN+
C2OUT
RA1/AN1
RA2/AN2
A
From VREF Module
-
+
C1
VIN-
VIN+
C1OUT
RA0/AN0
RA3/AN3
A
D
-
+
C2
VIN-
VIN+
C2OUT
RA1/AN1
RA2/AN2
A
CM<2:0> = 011
RA4 Open Drain
-
+
C1
VIN-
VIN+
C1OUT
RA0/AN0
RA3/AN3
A
D
-
+
C2
VIN-
VIN+
C2OUT
RA1/AN1
RA2/AN2
A
CM<2:0> = 110
-
+
C1
VIN-
VIN+
Off
(Read as '0')
RA0/AN0
RA3/AN3
D
CM<2:0> = 101
-
+
C2
VIN-
VIN+
C2OUT
RA1/AN1
RA2/AN2
A
-
+
C1
VIN-
VIN+
C1OUT
RA0/AN0
RA3/AN3
A
-
+
C2
VIN-
VIN+
C2OUT
RA1/AN1
RA2/AN2
A
CM<2:0> = 001
CIS=0
CIS=1
Comparators Reset
Two Independent Comparators
Two Common Reference Comparators
One Independent Comparator
Three Inputs Multiplexed to
Two Common Reference Comparators with Outputs
Four Inputs Multiplexed to
Comparators Off
Two Comparators
CM<2:0> = 010
CIS=0
CIS=1
CIS=0
CIS=1
A = Analog Input, Port Reads Zeros Always
D = Digital Input
CIS = CMCON<3>, Comparator Input Switch
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