Datasheet
PIC16F87XA
DS39582C-page 42 2001-2013 Microchip Technology Inc.
FIGURE 4-2: BLOCK DIAGRAM OF RA4/T0CKI PIN
FIGURE 4-3: BLOCK DIAGRAM OF RA5 PIN
Data Bus
WR PORTA
WR TRISA
RD PORTA
Data Latch
TRIS Latch
RD TRISA
Schmitt
Trigger
Input
Buffer
N
V
SS
I/O pin
(1)
TMR0 Clock Input
Q
D
QCK
QD
Q
CK
EN
QD
EN
C1OUT
Note 1: I/O pin has protection diodes to V
SS only.
CMCON<2:0> = x01 or 011
1
0
Data Bus
WR PORTA
WR TRISA
RD PORTA
Data Latch
TRIS Latch
RD TRISA
TTL
Input
Buffer
I/O pin
(1)
A/D Converter or SS Input
Q
D
QCK
QD
Q
CK
EN
QD
EN
C2OUT
CMCON<2:0> = 011 or 101
1
0
P
N
VSS
VDD
Note 1: I/O pin has protection diodes to VDD and VSS.
Analog
I
IP Mode