PIC16F639 Microchip Technology Inc., PIC16F639 Datasheet - Page 80

• Manufacturer Part Number: PIC16F639
• Description: 8/14-pin Flash-based, 8-bit Cmos Microcontrollers With Nanowatt Technology
• Manufacturer: Microchip Technology Inc.

PIC12F635/PIC16F636/639
FIGURE 7-8:
FIGURE 7-9:
DS41232D-page 78
Q1
Q3
C
CxOUT
Set CxIF (level)
CxIF
Q1
Q3
C
CxOUT
Set CxIF (level)
CxIF
IN
Note 1: If a change in the CMCON0 register
IN
+
+
cleared by CMCON0 read
2: When either comparator is first enabled,
(CxOUT) should occur when a read
operation is being executed (start of the
Q2 cycle), then the CxIF of the PIR1
register interrupt flag may not get set.
bias circuitry in the Comparator module
may cause an invalid output from the
comparator until the bias circuitry is stable.
Allow about 1 s for bias settling then clear
the mismatch condition and interrupt flags
before enabling comparator interrupts.
T
T
RT
RT
COMPARATOR
INTERRUPT TIMING W/O
CMCON0 READ
COMPARATOR
INTERRUPT TIMING WITH
CMCON0 READ
reset by software
reset by software
© 2007 Microchip Technology Inc.