PIC18F2480 MICROCHIP [Microchip Technology], PIC18F2480 Datasheet - Page 263

• Manufacturer Part Number: PIC18F2480
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

20.9
A simplified circuit for an analog input is shown in
Figure 20-4. Since the analog pins are connected to a
digital output, they have reverse biased diodes to V
and V
V
FIGURE 20-4:
TABLE 20-1:
 2004 Microchip Technology Inc.
CMCON
CVRCON
INTCON
IPR2
PIR2
PIE2
PORTA
LATA
TRISA
Legend: — = unimplemented, read as ‘0’. Shaded cells are unused by the comparator module.
Note 1:
SS
Name
and V
SS
2:
3:
. The analog input, therefore, must be between
Analog Input Connection
Considerations
(3)
(3)
DD
PORTA pins are enabled based on oscillator configuration.
These bits are available in PIC18F4X80 devices and reserved in PIC18F2X80 devices.
These registers are unimplemented on PIC18F2X80 devices.
. If the input voltage deviates from this
VA
GIE/GIEH PEIE/GIEL TMR0IE
TRISA7
LATA7
OSCFIP
OSCFIF
OSCFIE
CVREN
C2OUT
RA7
Bit 7
REGISTERS ASSOCIATED WITH COMPARATOR MODULE
R
(1)
S
Legend:
(1)
(1)
< 10k
COMPARATOR ANALOG INPUT MODEL
TRISA6
A
LATA6
CVROE
CMIP
CMIF
CMIE
C1OUT
RA6
IN
Bit 6
C
V
I
R
R
VA
(1)
C
5 pF
LEAKAGE
(2)
(2)
(2)
T
(1)
PIN
IC
S
(1)
PIN
LATA Data Output Register
PORTA Data Direction Register
C2INV
CVRR
Bit 5
RA5
—
—
—
= Input Capacitance
= Threshold Voltage
= Leakage Current at the pin due to various junctions
= Interconnect Resistance
= Source Impedance
= Analog Voltage
PIC18F2480/2580/4480/4580
CVRSS
INT0IE
Preliminary
C1INV
EEIP
EEIE
DD
V
Bit 4
EEIF
RA4
DD
V
V
T
T
= 0.6V
= 0.6V
BCLIP
BCLIF
BCLIE
CVR3
RBIE
Bit 3
RA3
range by more than 0.6V in either direction, one of the
diodes is forward biased and a latch-up condition may
occur. A maximum source impedance of 10 k
recommended for the analog sources. Any external
component connected to an analog input pin, such as
a capacitor or a Zener diode, should have very little
leakage current.
CIS
TMR0IF
HLVDIP
HLVDIE
HLVDIF
I
±500 nA
V
CVR2
LEAKAGE
Bit 2
CM2
RA2
SS
R
TMR3IP
TMR3IE
TMR3IF
INT0IF
IC
CVR1
Bit 1
CM1
RA1
ECCP1IP
ECCP1IE
ECCP1IF
CVR0
RBIF
Bit 0
CM0
Comparator
Input
RA0
DS39637A-page 261
on page
Values
Reset
51
51
52
51
51
52
52
52
52
is