参数资料
型号: PIC16C662T-04E/TQ
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PQFP44
封装: 10 X 10 MM, 1 MM HEIGHT, PLASTIC, TQFP-44
文件页数: 80/136页
文件大小: 634K
代理商: PIC16C662T-04E/TQ
PIC16C64X & PIC16C66X
DS30559A-page 48
Preliminary
1996 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
comparator 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 Table 12-2.
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
RA0/AN0
VIN-
VIN+
RA3/AN3
Off (Read as '0')
Comparators Reset (POR Default Value)
A
CM2:CM0 = 000
C2
RA1/AN1
VIN-
VIN+
RA2/AN2
Off (Read as '0')
A
C1
RA0/AN0
VIN-
VIN+
RA3/AN3
C1OUT
Two Independent Comparators
A
CM2:CM0 = 100
C2
RA1/AN1
VIN-
VIN+
RA2/AN2
C2OUT
A
C1
RA0/AN0
VIN-
VIN+
RA3/AN3
C1OUT
Two Common Reference Comparators
A
D
CM2:CM0 = 011
C2
RA1/AN1
VIN-
VIN+
RA2/AN2
C2OUT
A
C1
RA0/AN0
VIN-
VIN+
RA3/AN3
Off (Read as '0')
One Independent Comparator
D
CM2:CM0 = 101
C2
RA1/AN1
VIN-
VIN+
RA2/AN2
C2OUT
A
C1
RA0/AN0
VIN-
VIN+
RA3/AN3
Off (Read as '0')
Comparators Off
D
CM2:CM0 = 111
C2
RA1/AN1
VIN-
VIN+
RA2/AN2
Off (Read as '0')
D
C1
RA0/AN0
VIN-
VIN+
RA3/AN3
C1OUT
Four Inputs Multiplexed to Two Comparators
A
CM2:CM0 = 010
C2
RA1/AN1
VIN-
VIN+
RA2/AN2
C2OUT
A
From VREF Module
CIS = 0
CIS = 1
CIS = 0
CIS = 1
C1
RA0/AN0
VIN-
VIN+
RA3/AN3
C1OUT
Two Common Reference Comparators with Outputs
A
D
CM2:CM0 = 110
C2
RA1/AN1
VIN-
VIN+
RA2/AN2
C2OUT
A
RA4 Open Drain
C1
RA0/AN0
VIN-
VIN+
RA3/AN3
C1OUT
Three Inputs Multiplexed to Two Comparators
A
CM2:CM0 = 001
C2
RA1/AN1
VIN-
VIN+
RA2/AN2
C2OUT
A
CIS = 0
CIS = 1
A = Analog Input, port reads zeros always.
D = Digital Input.
CIS (CMCON<3>) is the Comparator Input Switch.
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