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PIC16F87XATI/SP Datasheet - Page 42

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