PIC12F609-I/PQTP MICROCHIP [Microchip Technology], PIC12F609-I/PQTP Datasheet - Page 55

• Manufacturer Part Number: PIC12F609-I/PQTP
• Description: 8-Pin Flash-Based, 8-Bit CMOS Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

8.0
The comparator can be used to interface analog
circuits to a digital circuit by comparing two analog
voltages and providing a digital indication of their
relative magnitudes. The comparator is a very useful
mixed signal building block because it provides analog
functionality independent of the program execution.
The Analog Comparator module includes the following
features:
• Programmable input section
• Comparator output is available internally/externally
• Programmable output polarity
• Interrupt-on-change
• Wake-up from Sleep
• PWM shutdown
• Timer1 gate (count enable)
• Output synchronization to Timer1 clock input
• Programmable voltage reference
• User-enable Comparator Hysteresis
8.1
The comparator is shown in Figure 8-1 along with the
relationship between the analog input levels and the
digital output. When the analog voltage at V
FIGURE 8-2:
© 2006 Microchip Technology Inc.
FixedRef
CV
CMV
COMPARATOR MODULE
REF
Comparator Overview
REN
CIN0-
CIN1-
0
1
MUX
CIN+
CMCH
COMPARATOR SIMPLIFIED BLOCK DIAGRAM
CMV
REF
Note 1:
CMR
0
1
MUX
0
1
MUX
2:
3:
4:
When CMON = 0, the comparator will produce a ‘0’ output to the XOR Gate.
Q1 and Q3 are phases of the four-phase system clock (F
Q1 is held high during Sleep mode.
Output shown for reference only. See I/O port pin diagram for more details.
CMV
CMV
PIC12F609/615/12HV609/615
IN
+ is less
IN
IN
+
-
Preliminary
CMON
CMPOL
(1)
From Timer1
than the analog voltage at V
parator is a digital low level. When the analog voltage
at V
output of the comparator is a digital high level.
FIGURE 8-1:SINGLE COMPARATOR
Clock
Q3*RD_CMCON0
Output
Note:
IN
+ is greater than the analog voltage at V
Q1
V
V
V
V
IN
IN
IN
IN
D
+
-
-
+
D
EN
Reset
The black areas of the output of the
comparator represents the uncertainty
due to input offsets and response time.
Q
Q
CMSYNC
D
EN
CMPOL
CL
0
1
MUX
Q
+
–
To PWM Auto-Shutdown
OSC
IN
-, the output of the com-
).
SYNCCMOUT
To Timer1 Gate
RD_CMCON0
CMOE
DS41302A-page 53
Set CMIF
Data Bus
Output
COUT
To
(4)
IN
-, the