PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 242

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18CXX8
19.9
A simplified circuit for an analog input is shown in
Figure 19-4. Since the analog pins are connected to a
digital output, they have reverse biased diodes to V
and V
V
range by more than 0.6 V in either direction, one of the
diodes is forward biased and a latch-up condition may
occur. A maximum source impedance of 10 k
ommended for the analog sources. Any external com-
ponent connected to an analog input pin, such as a
capacitor or a Zener diode, should have very little leak-
age current.
FIGURE 19-4: ANALOG INPUT MODEL
TABLE 19-1:
DS30475A-page 242
Name
CMCON
VRCON
INTCON
PIR2
PIE2
IPR2
PORTF
LATF
TRISF
Legend: x = unknown, u = unchanged, - = unimplemented, read as "0"
SS
and V
SS
. The analog input, therefore, must be between
Analog Input Connection
Considerations
DD
PORTF Data Direction Register
C2OUT C1OUT
LATF7
VREN
. If the input voltage deviates from this
GIEH
Bit 7
GIE/
RF7
VA
—
—
—
Legend:
REGISTERS ASSOCIATED WITH COMPARATOR MODULE
R
S
< 10k
VROE
LATF6
PEIE/
CMIF
CMIE
CMIP
Bit 6
GIEL
RF6
A
IN
C
V
I
R
R
VA
LEAKAGE
PIN
T
IC
S
TMR0IE
C2INV
LATF5
C
5 pF
Bit 5
VRR
RF5
PIN
—
—
—
=
=
=
=
=
=
Advanced Information
C1INV
LATF4
VRSS
INTIE
Bit 4
RF4
—
—
—
Input Capacitance
Threshold Voltage
Leakage Current at the pin due to various junctions
Interconnect Resistance
Source Impedance
Analog Voltage
is rec-
DD
V
BCLIF
BCLIE
BCLIP
LATF3
RBIE
Bit 3
VR3
RF3
CIS
DD
V
V
T
T
= 0.6 V
= 0.6 V
TMR0IF
LVDIE
LVDIP
LATF2
LVDIF
Bit 2
CM2
VR2
RF2
TMR3IF CCP2IF -0-- 0000 -0-- 0000
TMR3IE CCP2IE -0-- 0000 -0-- 0000
TMR3IP CCP2IP -1-- 1111 -1-- 1111
LATF1
INTIF
Bit 1
CM1
VR1
RF1
I
V
LEAKAGE
500 nA
SS
LATF0
RBIF
Bit 0
CM0
VR0
RF0
R
IC
2000 Microchip Technology Inc.
0000 0000 0000 0000
0000 0000 0000 0000
0000 000x 0000 000u
x000 0000 u000 0000
xxxx xxxx uuuu uuuu
1111 1111 1111 1111
Value on
POR
All Other
Value on
RESETS