PIC16F627-04 Microchip Technology, PIC16F627-04 Datasheet - Page 60

• Manufacturer Part Number: PIC16F627-04
• Description: FLASH-Based 8-Bit CMOS Microcontrollers
• Manufacturer: Microchip Technology

PIC16F62X
9.4
Response time is the minimum time, after selecting a
new reference voltage or input source, before the
comparator output is guaranteed to have a valid level.
If the internal reference is changed, the maximum delay
of the internal voltage reference must be considered
when using the comparator outputs. Otherwise the
maximum delay of the comparators should be used
(Table 12-2 ).
FIGURE 9-3:
DS40300B-page 60
Set CMIF bit
To RA3 or RA4/T0CK1 pin
Comparator Response Time
To Data Bus
MODIFIED COMPARATOR OUTPUT BLOCK DIAGRAM
From other Comparator
RD CMCON
Preliminary
Q
Q
EN
9.5
The comparator outputs are read through the CMCON
register. These bits are read only. The comparator
outputs may also be directly output to the RA3 and RA4
I/O pins. When the CM<2:0> = 110 or 001, multiplexors
in the output path of the RA3 and RA4/T0CK1 pins will
switch and the output of each pin will be the unsynchro-
nized output of the comparator. The uncertainty of each
of the comparators is related to the input offset voltage
and the response time given in the specifications.
Figure 9-3 shows the comparator output block diagram.
The TRISA bits will still function as an output
enable/disable for the RA3 and RA4/T0CK1 pins while
in this mode.
CL
D
EN
Note 1: When reading the PORT register, all pins
D
NRESET
2: Analog levels on any pin that is defined
Comparator Outputs
Q1
configured as analog inputs will read as
a ‘0’. Pins configured as digital inputs will
convert an analog input according to the
Schmitt Trigger input specification.
as a digital input may cause the input
buffer to consume more current than is
specified.
MULTIPLEX
Port Pins
Q3 * RD CMCON
1999 Microchip Technology Inc.
CnINV