PIC18F4420T-I/PT Microchip Technology, PIC18F4420T-I/PT Datasheet - Page 236

• Manufacturer Part Number: PIC18F4420T-I/PT
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,44PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4420T-I/PT

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F2420/2520/4420/4520
20.1
There are eight modes of operation for the compara-
tors, shown in Figure 20-1. Bits CM<2:0> of the
CMCON register are used to select these modes. The
TRISA register controls the data direction of the com-
parator pins for each mode. If the Comparator mode is
FIGURE 20-1:
DS39631E-page 234
Comparators Reset
CM<2:0> = 000
Two Independent Comparators
CM<2:0> = 010
Two Common Reference Comparators
CM<2:0> = 100
One Independent Comparator with Output
CM<2:0> = 001
A = Analog Input, port reads zeros always
* Setting the TRISA<5:4> bits will disable the comparator outputs by configuring the pins as inputs.
RA4/T0CKI/C1OUT*
RA0/AN0
RA3/AN3/
V
RA1/AN1
RA2/AN2/
V
RA0/AN0
RA3/AN3/
V
RA1/AN1
RA2/AN2/
V
RA0/AN0
RA3/AN3/
V
RA1/AN1
RA2/AN2/
V
RA0/AN0
RA3/AN3/
V
RA1/AN1
RA2/AN2/
V
REF
REF
REF
REF
REF
REF
REF
REF
+
-/CV
+
-/CV
+
-/CV
+
-/CV
Comparator Configuration
REF
REF
REF
REF
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 (Read as ‘0’)
Off (Read as ‘0’)
C1OUT
C2OUT
C1OUT
C2OUT
C1OUT
Off (Read as ‘0’)
D = Digital Input
Two Common Reference Comparators with Outputs
CM<2:0> = 101
Two Independent Comparators with Outputs
CM<2:0> = 011
Comparators Off (POR Default Value)
CM<2:0> = 111
Four Inputs Multiplexed to Two Comparators
CM<2:0> = 110
RA0/AN0
RA3/AN3/
V
RA1/AN1
RA2/AN2/
V
RA0/AN0
RA3/AN3/
V
RA4/T0CKI/C1OUT*
RA1/AN1
RA2/AN2/
V
RA5/AN4/SS/HLVDIN/C2OUT*
RA0/AN0
RA3/AN3/
V
RA4/T0CKI/C1OUT*
RA1/AN1
RA2/AN2/
V
RA5/AN4/SS/HLVDIN/C2OUT*
RA0/AN0
RA3/AN3/
V
RA1/AN1
RA2/AN2/
V
REF
REF
REF
REF
REF
REF
REF
REF
changed, the comparator output level may not be valid
for the specified mode change delay shown in
Section 26.0 “Electrical Characteristics”.
Note:
CIS (CMCON<3>) is the Comparator Input Switch
+
-/CV
+
-/CV
+
-/CV
+
-/CV
REF
REF
REF
REF
A
A
A
A
D
D
D
D
A
A
A
A
A
A
A
D
Comparator interrupts should be disabled
during a Comparator mode change;
otherwise, a false interrupt may occur.
V
V
V
V
V
V
V
V
CIS = 0
CIS = 1
CIS = 0
CIS = 1
V
V
V
V
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
-
+
-
+
-
+
-
+
-
+
-
+
© 2008 Microchip Technology Inc.
C1
C2
C1
C2
C1
C2
V
V
V
V
IN
IN
IN
IN
CV
-
+
-
+
REF
C1OUT
C2OUT
Off (Read as ‘0’)
Off (Read as ‘0’)
C1
C2
C1OUT
C2OUT
From V
REF
C1OUT
C2OUT
Module