PIC16F688-I/P Microchip Technology Inc., PIC16F688-I/P Datasheet - Page 62
PIC16F688-I/P
Manufacturer Part Number
PIC16F688-I/P
Description
14 PIN, 7 KB FLASH, 256 RAM, 12 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F688-IP.pdf
(202 pages)
Specifications of PIC16F688-I/P
A/d Inputs
8-Channel, 10-Bit
Comparators
2
Cpu Speed
5 MIPS
Eeprom Memory
256 Bytes
Input Output
12
Interface
USART
Memory Type
Flash
Number Of Bits
8
Package Type
14-pin PDIP
Programmable Memory
7K Bytes
Ram Size
256 Bytes
Speed
20 MHz
Timers
1-8-bit, 1-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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PIC16F688
FIGURE 7-6:
FIGURE 7-7:
DS41203C-page 60
Q1
Q3
C
C
Set CMIF (level)
CMIF
Q1
Q3
C
C
Set CMIF (level)
CMIF
IN
OUT
IN
OUT
Note 1: If a change in the CM1CON0 register
+
+
cleared by CMCON0 read
2: When either comparator is first enabled,
(CxOUT) occurs when a read operation is
being executed (start of the Q2 cycle),
then the CxIF Interrupt Flag bit of the
PIR1 register 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
7.6
The comparator, if enabled before entering Sleep mode,
remains active during Sleep. The additional current
consumed by the comparator is shown separately in
Section 14.0 “Electrical Specifications”. If the
comparator is not used to wake the device, power
consumption can be minimized while in Sleep mode by
turning off the comparator. The comparator is turned off
by selecting mode CM<2:0> = 000 or CM<2:0> = 111
of the CMCON0 register.
A change to the comparator output can wake-up the
device from Sleep. To enable the comparator to wake
the device from Sleep, the CxIE bit of the PIE1 register
and the PEIE bit of the INTCON register must be set.
The instruction following the Sleep instruction always
executes following a wake from Sleep. If the GIE bit of
the INTCON register is also set, the device will then
execute the Interrupt Service Routine.
7.7
A device Reset forces the CMCON0 and CMCON1
registers to their Reset states. This forces the Compar-
ator module to be in the Comparator Reset mode
(CM<2:0> = 000). Thus, all comparator inputs are
analog inputs with the comparator disabled to consume
the smallest current possible.
Operation During Sleep
Effects of a Reset
© 2006 Microchip Technology Inc.
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