PIC16C62X(A)
FIGURE 5-3: BLOCK DIAGRAM OF RA3 PIN
Data
bus
WR
PortA
D
Q
CK Q
Data Latch
Comparator Mode = 110
Comparator Output
D
Q
WR
TRISA
CK Q
TRIS Latch
RD TRISA
RD PORTA
VDD
P
N
RA3 Pin
VSS
Analog
Input Mode
Schmitt Trigger
Input Buffer
Q
D
EN
To Comparator
Note: I/O pins have protection diodes to VDD and VSS
FIGURE 5-4: BLOCK DIAGRAM OF RA4 PIN
Data
bus
WR
PortA
D
Q
CK Q
Data Latch
Comparator Mode = 110
Comparator Output
D
Q
WR
TRISA
CK Q
TRIS Latch
N
RA4 Pin
VSS
RD TRISA
RD PORTA
TMR0 Clock Input
Note: RA4 has protection diodes to VSS only
Schmitt Trigger
Input Buffer
Q
D
EN
DS30235F-page 26
Preliminary
© 1997 Microchip Technology Inc.