PIC18F6621-I/PT Microchip Technology Inc., PIC18F6621-I/PT Datasheet - Page 246

• Manufacturer Part Number: PIC18F6621-I/PT
• Description: 64 PIN, 64 KB FLASH, 3840 RAM, 52 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F6621-I/PT

• A/d Inputs: 12-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 10 MIPS
• Eeprom Memory: 1024 Bytes
• Input Output: 54
• Interface: I2C/SPI/UART/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 64-pin TQFP
• Programmable Memory: 64K Bytes
• Ram Size: 3.8K Bytes
• Speed: 40 MHz
• Timers: 2-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC18F6525/6621/8525/8621
21.1
There are eight modes of operation for the compara-
tors. The CMCON register is used to select these
modes. Figure 21-1 shows the eight possible modes.
The TRISF register controls the data direction of the
comparator pins for each mode. If the Comparator
FIGURE 21-1:
DS39612B-page 244
Comparators Reset (POR Default Value)
CM2:CM0 = 000
Two Independent Comparators
CM2:CM0 = 010
Two Common Reference Comparators
CM2:CM0 = 100
One Independent Comparator with Output
CM2:CM0 = 001
A = Analog Input, port reads zeros always
RF6/AN11
RF5/AN10/
CV
RF4/AN9
RF3/AN8
RF6/AN11
RF5/AN10/
CV
RF4/AN9
RF3/AN8
RF6/AN11
RF5/AN10/
CV
RF4/AN9
RF3/AN8
RF6/AN11
RF5/AN10/
CV
RF2/AN7/C1OUT
RF4/AN9
RF3/AN8
REF
REF
REF
REF
Comparator Configuration
A
A
A
A
A
A
A
A
A
A
A
D
A
A
D
D
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
COMPARATOR I/O OPERATING MODES
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
C1
C2
C1
C2
C1
C2
C1
C2
Off
Off
C1OUT
C2OUT
C1OUT
C2OUT
C1OUT
Off
(Read as ‘0’)
(Read as ‘0’)
(Read as ‘0’)
D = Digital Input
Two Common Reference Comparators with Outputs
CM2:CM0 = 101
Two Independent Comparators with Outputs
CM2:CM0 = 011
Comparators Off
CM2:CM0 = 111
Four Inputs Multiplexed to Two Comparators
CM2:CM0 = 110
RF6/AN11
RF5/AN10/
CV
RF2/AN7/C1OUT
RF4/AN9
RF3/AN8
RF1/AN6/C2OUT
RF2/AN7/C1OUT
RF6/AN11
RF5/AN10/
CV
RF4/AN9
RF3/AN8
RF6/AN11
RF5/AN10/
CV
RF4/AN9
RF3/AN8
RF6/AN11
RF5/AN10/
CV
RF4/AN9
RF3/AN8
RF1/AN6/C2OUT
mode is changed, the comparator output level may not
be valid for the specified mode change delay shown in
Section 27.0 “Electrical Characteristics”.
CIS (CMCON<3>) is the Comparator Input Switch
REF
Note:
REF
REF
REF
A
A
A
A
D
D
D
D
A
A
A
D
A
A
A
A
Comparator interrupts should be disabled
during a Comparator mode change;
otherwise, a false interrupt may occur.
V
V
V
V
V
V
V
V
V
V
V
V
CIS = 0
CIS = 1
CIS = 0
CIS = 1
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
-
+
-
+
-
+
-
+
-
+
-
+
 2005 Microchip Technology Inc.
C1
C2
C1
C2
C1
C2
V
V
V
V
IN
IN
IN
IN
CV
-
+
-
+
REF
C1OUT
C2OUT
Off
Off
C1OUT
C2OUT
C1
C2
From V
(Read as ‘0’)
(Read as ‘0’)
REF
C1OUT
C2OUT
Module