PIC16F87XA
FIGURE 4-2:
BLOCK DIAGRAM OF RA4/T0CKI PIN
CMCON<2:0> = ‘
x01
’ or ‘
011
’
C1OUT
Data Latch
Data Bus
WR PORTA
D
Q
Q
1
N
I/O pin
(1)
CK
0
TRIS Latch
D
WR TRISA
Q
Q
V
SS
CK
Schmitt
Trigger
Input
Buffer
RD TRISA
Q
D
EN
EN
RD PORTA
TMR0 Clock Input
Note 1:
I/O pin has protection diodes to V
SS
only.
FIGURE 4-3:
BLOCK DIAGRAM OF RA5 PIN
CMCON<2:0> = ‘
011
’ or ‘
101
’
C2OUT
Data Latch
Data Bus
WR PORTA
D
Q
Q
1
V
DD
P
CK
0
N
I/O pin
(1)
TRIS Latch
D
WR TRISA
Q
Q
CK
V
SS
Schmitt
Trigger
Input
Buffer
RD TRISA
Q
D
EN
EN
RD PORTA
A/D Converter or SS Input
Note 1:
I/O pin has protection diodes to V
DD
and V
SS
.
DS39582A-page 40
Advance Information
2001 Microchip Technology Inc.